CVE-2026-24281

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-24281", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-01-21T19:40:25.776Z", "datePublished": "2026-03-07T08:50:32.525Z", "dateUpdated": "2026-07-15T01:17:24.357Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.zookeeper:zookeeper", "product": "Apache ZooKeeper", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.4", "status": "affected", "version": "3.9.0", "versionType": "maven"}, {"lessThanOrEqual": "3.8.5", "status": "affected", "version": "3.8.0", "versionType": "maven"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Nikita Markevich <markevich.nikita1@gmail.com>"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.<br><br><br><br><br><br>"}], "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols."}], "metrics": [{"other": {"content": {"text": "important"}, "type": "Textual description of severity"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-350", "description": "CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-295", "description": "CWE-295 Improper Certificate Validation", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-03-07T08:50:32.525Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2"}], "source": {"defect": ["ZOOKEEPER-4986"], "discovery": "UNKNOWN"}, "title": "Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/07/4"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-07T17:05:10.486Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-03-10T17:36:42.765646Z", "id": "CVE-2026-24281", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-10T17:37:28.087Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.12"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.12.7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.13"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.13.5", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.14"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.14.0", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_streams:2.9::el9"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Streams for Apache Kafka 2.9.4", "vendor": "Red Hat"}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:openshift_ai:2.25::el9"], "defaultStatus": "affected", "packageName": "rhoai/odh-modelmesh-rhel9", "product": "Red Hat OpenShift AI 2.25", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1776756834", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:camel_spring_boot:4"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat build of Apache Camel for Spring Boot 4", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:debezium:2"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat build of Debezium 2", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:debezium:3"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat build of Debezium 3", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_data_grid:8"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat Data Grid 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_fuse:7"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat Fuse 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:7"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:8"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jbosseapxp"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:offline_knowledge_portal:1"], "defaultStatus": "affected", "packageName": "offline-knowledge-portal/rhokp-rhel9", "product": "Red Hat Offline Knowledge Portal", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift_ai"], "defaultStatus": "affected", "packageName": "rhoai/odh-modelmesh-rhel8", "product": "Red Hat OpenShift AI (RHOAI)", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_streams:3"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "streams for Apache Kafka 3", "vendor": "Red Hat"}], "datePublic": "2026-03-07T08:50:32.525Z", "descriptions": [{"lang": "en", "value": "A flaw was found in Apache ZooKeeper. The ZKTrustManager component's hostname verification process can fall back to reverse DNS (PTR) lookup when IP Subject Alternative Name (SAN) validation fails. This vulnerability allows an attacker who can control or spoof PTR records to impersonate ZooKeeper servers or clients, provided they possess a valid certificate for the PTR name. This could lead to unauthorized access or manipulation of ZooKeeper services."}], "metrics": [{"other": {"content": {"namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "format": "CVSS"}], "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "description": "Improper Certificate Validation", "lang": "en", "type": "CWE"}]}], "references": [{"tags": ["vdb-entry", "x_refsource_REDHAT"], "url": "https://access.redhat.com/security/cve/CVE-2026-24281"}, {"name": "RHBZ#2445449", "tags": ["issue-tracking", "x_refsource_REDHAT"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445449"}, {"tags": ["x_sadp-csaf-vex"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:14276"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:14272"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:8509"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:10184"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:34608"}], "solutions": [{"lang": "en", "value": "RHSA-2026:14276: Red Hat AMQ Broker 7.12.7"}, {"lang": "en", "value": "RHSA-2026:14272: Red Hat AMQ Broker 7.13.5"}, {"lang": "en", "value": "RHSA-2026:8509: Red Hat AMQ Broker 7.14.0"}, {"lang": "en", "value": "RHSA-2026:10184: Red Hat OpenShift AI 2.25"}, {"lang": "en", "value": "RHSA-2026:34608: Streams for Apache Kafka 2.9.4"}], "timeline": [{"lang": "en", "time": "2026-03-07T09:00:57.868Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-03-07T08:50:32.525Z", "value": "Made public."}], "title": "Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing", "workarounds": [{"lang": "en", "value": "To mitigate this issue, disable reverse DNS lookup in Apache ZooKeeper's client and quorum protocols. This can be achieved by configuring the `zookeeper.ssl.hostnameVerification.disableReverseDns` property to `true`. This configuration option is available in Apache ZooKeeper versions 3.8.6 and 3.9.5 and later. A restart of the ZooKeeper service will be required for the change to take effect."}], "x_adpType": "supplier", "x_generator": {"engine": "sadp-cli 1.0.0"}, "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:17:24.357Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/07/4"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-07T17:05:10.486Z"}}, {"title": "Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing", "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"cpes": ["cpe:/a:redhat:amq_broker:7.12"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7.12.7", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:amq_broker:7.13"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7.13.5", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:amq_broker:7.14"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7.14.0", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:amq_streams:2.9::el9"], "vendor": "Red Hat", "product": "Streams for Apache Kafka 2.9.4", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openshift_ai:2.25::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift AI 2.25", "versions": [{"status": "unaffected", "version": "1776756834", "lessThan": "*", "versionType": "rpm"}], "packageName": "rhoai/odh-modelmesh-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:camel_spring_boot:4"], "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:debezium:2"], "vendor": "Red Hat", "product": "Red Hat build of Debezium 2", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:debezium:3"], "vendor": "Red Hat", "product": "Red Hat build of Debezium 3", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_data_grid:8"], "vendor": "Red Hat", "product": "Red Hat Data Grid 8", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jboss_fuse:7"], "vendor": "Red Hat", "product": "Red Hat Fuse 7", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:7"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:8"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jbosseapxp"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:offline_knowledge_portal:1"], "vendor": "Red Hat", "product": "Red Hat Offline Knowledge Portal", "packageName": "offline-knowledge-portal/rhokp-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift_ai"], "vendor": "Red Hat", "product": "Red Hat OpenShift AI (RHOAI)", "packageName": "rhoai/odh-modelmesh-rhel8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:amq_streams:3"], "vendor": "Red Hat", "product": "streams for Apache Kafka 3", "packageName": "zookeeper", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}], "timeline": [{"lang": "en", "time": "2026-03-07T09:00:57.868Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-03-07T08:50:32.525Z", "value": "Made public."}], "solutions": [{"lang": "en", "value": "RHSA-2026:14276: Red Hat AMQ Broker 7.12.7"}, {"lang": "en", "value": "RHSA-2026:14272: Red Hat AMQ Broker 7.13.5"}, {"lang": "en", "value": "RHSA-2026:8509: Red Hat AMQ Broker 7.14.0"}, {"lang": "en", "value": "RHSA-2026:10184: Red Hat OpenShift AI 2.25"}, {"lang": "en", "value": "RHSA-2026:34608: Streams for Apache Kafka 2.9.4"}], "x_adpType": "supplier", "datePublic": "2026-03-07T08:50:32.525Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-24281", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445449", "name": "RHBZ#2445449", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json", "tags": ["x_sadp-csaf-vex"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:14276", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:14272", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:8509", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:10184", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:34608", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "To mitigate this issue, disable reverse DNS lookup in Apache ZooKeeper's client and quorum protocols. This can be achieved by configuring the `zookeeper.ssl.hostnameVerification.disableReverseDns` property to `true`. This configuration option is available in Apache ZooKeeper versions 3.8.6 and 3.9.5 and later. A restart of the ZooKeeper service will be required for the change to take effect."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in Apache ZooKeeper. The ZKTrustManager component's hostname verification process can fall back to reverse DNS (PTR) lookup when IP Subject Alternative Name (SAN) validation fails. This vulnerability allows an attacker who can control or spoof PTR records to impersonate ZooKeeper servers or clients, provided they possess a valid certificate for the PTR name. This could lead to unauthorized access or manipulation of ZooKeeper services."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-295", "description": "Improper Certificate Validation"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:17:24.357Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-24281", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-10T17:36:42.765646Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-10T17:37:12.949Z"}}], "cna": {"title": "Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager", "source": {"defect": ["ZOOKEEPER-4986"], "discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "Nikita Markevich <markevich.nikita1@gmail.com>"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache ZooKeeper", "versions": [{"status": "affected", "version": "3.9.0", "versionType": "maven", "lessThanOrEqual": "3.9.4"}, {"status": "affected", "version": "3.8.0", "versionType": "maven", "lessThanOrEqual": "3.8.5"}], "packageName": "org.apache.zookeeper:zookeeper", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}], "references": [{"url": "https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.", "supportingMedia": [{"type": "text/html", "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.<br><br><br><br><br><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-350", "description": "CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-295", "description": "CWE-295 Improper Certificate Validation"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-03-07T08:50:32.525Z"}}}, "cveMetadata": {"cveId": "CVE-2026-24281", "state": "PUBLISHED", "dateUpdated": "2026-07-15T01:17:24.357Z", "dateReserved": "2026-01-21T19:40:25.776Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-03-07T08:50:32.525Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.zookeeper:zookeeper", "product": "Apache ZooKeeper", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.4", "status": "affected", "version": "3.9.0", "versionType": "maven"}, {"lessThanOrEqual": "3.8.5", "status": "affected", "version": "3.8.0", "versionType": "maven"}]}], "source": "security@apache.org"}, {"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.12"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.12.7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.13"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.13.5", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_broker:7.14"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat AMQ Broker 7.14.0", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_streams:2.9::el9"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Streams for Apache Kafka 2.9.4", "vendor": "Red Hat"}, {"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:openshift_ai:2.25::el9"], "defaultStatus": "affected", "packageName": "rhoai/odh-modelmesh-rhel9", "product": "Red Hat OpenShift AI 2.25", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1776756834", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:camel_spring_boot:4"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat build of Apache Camel for Spring Boot 4", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:debezium:2"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat build of Debezium 2", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:debezium:3"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat build of Debezium 3", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_data_grid:8"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat Data Grid 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_fuse:7"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat Fuse 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:7"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:8"], "defaultStatus": "unaffected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jbosseapxp"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:offline_knowledge_portal:1"], "defaultStatus": "affected", "packageName": "offline-knowledge-portal/rhokp-rhel9", "product": "Red Hat Offline Knowledge Portal", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift_ai"], "defaultStatus": "affected", "packageName": "rhoai/odh-modelmesh-rhel8", "product": "Red Hat OpenShift AI (RHOAI)", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:amq_streams:3"], "defaultStatus": "affected", "packageName": "zookeeper", "product": "streams for Apache Kafka 3", "vendor": "Red Hat"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*", "matchCriteriaId": "1D3E8670-F4DD-400A-A459-9396353D5E7A", "versionEndExcluding": "3.8.6", "versionStartIncluding": "3.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*", "matchCriteriaId": "69917DB8-268C-4F60-AFAE-51FB24101BFE", "versionEndExcluding": "3.9.5", "versionStartIncluding": "3.9.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols."}, {"lang": "es", "value": "La verificaci\u00f3n de nombre de host en Apache ZooKeeper ZKTrustManager recurre a DNS inverso (PTR) cuando falla la validaci\u00f3n IP SAN, permitiendo a los atacantes que controlan o falsifican registros PTR suplantar servidores o clientes de ZooKeeper con un certificado v\u00e1lido para el nombre PTR. Es importante se\u00f1alar que el atacante debe presentar un certificado que sea de confianza para ZKTrustManager, lo que hace que el vector de ataque sea m\u00e1s dif\u00edcil de explotar. Se recomienda a los usuarios actualizar a la versi\u00f3n 3.8.6 o 3.9.5, que corrige este problema al introducir una nueva opci\u00f3n de configuraci\u00f3n para deshabilitar la b\u00fasqueda de DNS inverso en los protocolos de cliente y qu\u00f3rum."}], "id": "CVE-2026-24281", "lastModified": "2026-07-15T02:18:48.563", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-24281", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-10T17:36:42.765646Z", "version": "2.0.3"}}]}, "published": "2026-03-07T09:16:07.437", "references": [{"source": "security@apache.org", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/03/07/4"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10184"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:14272"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:14276"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:34608"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:8509"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-24281"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445449"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}, {"lang": "en", "value": "CWE-350"}], "source": "security@apache.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-295"}], "source": "nvd@nist.gov", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-295"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing", "id": "2445449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445449"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable reverse DNS lookup in Apache ZooKeeper's client and quorum protocols. This can be achieved by configuring the `zookeeper.ssl.hostnameVerification.disableReverseDns` property to `true`. This configuration option is available in Apache ZooKeeper versions 3.8.6 and 3.9.5 and later. A restart of the ZooKeeper service will be required for the change to take effect."}, "name": "CVE-2026-24281", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:debezium:2", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat build of Debezium 2"}, {"cpe": "cpe:/a:redhat:debezium:3", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat build of Debezium 3"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:offline_knowledge_portal:1", "fix_state": "Fix deferred", "package_name": "offline-knowledge-portal/rhokp-rhel9", "product_name": "Red Hat Offline Knowledge Portal"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-modelmesh-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-modelmesh-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-03-07T08:50:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-24281\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-24281\nhttps://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.9.0,3.9.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.8.0,3.8.5]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache ZooKeeper", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "zookeeper", "vendor": "apache"}], "analysis": {"en": {"generated_at": "2026-04-17T12:13:11.379857+00:00", "value": {"mitigation_remediation": ["Upgrade Apache ZooKeeper to version 3.8.6 or 3.9.5", "Configure the server and clients to disable reverse DNS lookups by setting the reverseDnsLookupEnabled option to false in the ZKTrustManager configuration", "Verify that no reverse DNS (PTR) records are pointing to ZooKeeper servers or clients and coordinate with DNS administrators to remove or secure any such records"], "summary": {"action": "Immediate Patch", "impact": "Impersonation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Apache ZooKeeper versions that use the default configuration of ZKTrustManager. Users should verify the installed package is prior to 3.8.6 or 3.9.5. Upgrading to version 3.8.6 or 3.9.5, which introduce a configuration option to disable reverse DNS lookup in client and quorum protocols, eliminates the risk. The vendor is the Apache Software Foundation.", "description_and_impact": "Hostname verification in Apache ZooKeeper\u2019s ZKTrustManager falls back to using reverse DNS (PTR) records when subject alternative name validation of an IP fails. This flaw allows an attacker who controls or can spoof PTR entries to make a server or client appear to present a valid certificate for the PTR name. The result is that malicious components can impersonate legitimate ZooKeeper peers, gaining unauthorized access and potentially authenticating as trusted nodes. The weakness is related to improper validation of hostnames (CWE-295) and failure to properly verify cryptographic parameters (CWE-350).", "risk_and_exploitability": "The CVSS score of 5.9 indicates a moderate impact if exploited. However, the EPSS score of less than 1% reflects a very low probability of real-world exploitation. Exploitation requires the attacker to possess a certificate trusted by the ZooKeeper trust manager and to control PTR records pointing to this certificate. The vulnerability is not listed in CISA\u2019s KEV, so no widespread exploitation reports are known. The risk remains lower than major threats but sufficient to justify immediate patching if the environment uses a vulnerable ZooKeeper version."}}}}, "created": "2026-03-09T10:05:29.712918+00:00", "updated": "2026-04-17T12:15:18.173678+00:00", "vendors": ["apache", "apache$PRODUCT$zookeeper"]}