CVE-2026-100252

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The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the zookeeper.security.auth_to_local rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks.\n\nAn authenticated client whose principal is not covered by the auth_to_local rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in sasl ACLs. If the requested identity matches a configured zookeeper.superUser, it gets superuser access to the whole data tree.\n\nUsers are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Improper Authorization vulnerability in Apache ZooKeeper.<br><span><br>When SASL authentication is enabled on the client port, the server's SASL callback handler grants every authorization identity (authzid) that a client requests, without checking it against the principal the client authenticated as. The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the </span><code>zookeeper.security.auth_to_local</code><span> rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks.<br></span><span><br>An authenticated client whose principal is not covered by the </span><code>auth_to_local</code><span> rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in </span><code>sasl</code><span> ACLs. If the requested identity matches a configured </span><code>zookeeper.superUser</code><span>, it gets superuser access to the whole data tree.<br></span><span><br></span><span>Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.</span></p>"}]}], "references": [{"url": "https://lists.apache.org/thread.html/81rdyqlmlp3dtkkqgp8t5080g3b9r2pj", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"scenarios": [{"lang": "en", "value": "GENERAL"}], "format": "CVSS", "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.6, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "cunyi li <xiaoheihei1107@gmail.com>", "type": "reporter"}, {"lang": "en", "value": "Prasath Jayasundar & PayPal Cyber Security Team", "type": "reporter"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/11/03/10"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-11-04T11:09:10.129Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-04T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-100252"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T04:55:52.687Z"}}]}}

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The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the zookeeper.security.auth_to_local rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks.\n\nAn authenticated client whose principal is not covered by the auth_to_local rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in sasl ACLs. If the requested identity matches a configured zookeeper.superUser, it gets superuser access to the whole data tree.\n\nUsers are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Authorization vulnerability in Apache ZooKeeper.<br><span><br>When SASL authentication is enabled on the client port, the server's SASL callback handler grants every authorization identity (authzid) that a client requests, without checking it against the principal the client authenticated as. The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the </span><code>zookeeper.security.auth_to_local</code><span> rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks.<br></span><span><br>An authenticated client whose principal is not covered by the </span><code>auth_to_local</code><span> rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in </span><code>sasl</code><span> ACLs. If the requested identity matches a configured </span><code>zookeeper.superUser</code><span>, it gets superuser access to the whole data tree.<br></span><span><br></span><span>Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.</span></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "CWE-863 Incorrect Authorization"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-11-04T10:44:17.367Z"}}}, "cveMetadata": {"cveId": "CVE-2026-100252", "state": "PUBLISHED", "dateUpdated": "2026-11-05T04:55:52.687Z", "dateReserved": "2026-09-25T16:45:48.869Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-11-04T10:44:17.367Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.zookeeper:zookeeper", "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper", "product": "Apache ZooKeeper", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.6", "status": "affected", "version": "3.9.0", "versionType": "maven"}, {"lessThanOrEqual": "3.8.7", "status": "affected", "version": "3.8.0", "versionType": "maven"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Authorization vulnerability in Apache ZooKeeper.\n\nWhen SASL authentication is enabled on the client port, the server's SASL callback handler grants every authorization identity (authzid) that a client requests, without checking it against the principal the client authenticated as. The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the zookeeper.security.auth_to_local rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks.\n\nAn authenticated client whose principal is not covered by the auth_to_local rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in sasl ACLs. If the requested identity matches a configured zookeeper.superUser, it gets superuser access to the whole data tree.\n\nUsers are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue."}], "id": "CVE-2026-100252", "lastModified": "2026-11-05T05:18:18.290", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@apache.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-100252", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-11-04T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-11-04T11:17:06.717", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/81rdyqlmlp3dtkkqgp8t5080g3b9r2pj"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/11/03/10"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "org.apache.zookeeper/zookeeper: zookeeper: Privilege escalation via improper SASL authorization identity validation", "id": "2566833", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566833"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-807", "details": ["A flaw was found in Apache ZooKeeper. When Simple Authentication and Security Layer (SASL) authentication is enabled, the server fails to properly validate the authorization identity requested by a client against its authenticated credentials. An authenticated remote client can exploit this flaw by requesting an arbitrary identity when local mapping rules do not match the authenticated principal. This can lead to privilege escalation, allowing the attacker to gain unauthorized access or superuser administrative control over the entire ZooKeeper data tree."], "mitigation": {"lang": "en:us", "value": "1. Network Access Control:\nRestrict network reachability to the ZooKeeper client port (default TCP 2181) so that only trusted client nodes and application services can connect. On Red Hat Enterprise Linux systems running firewalld, restrict access to a dedicated trusted zone:\nfirewall-cmd --zone=trusted --add-source=<TRUSTED_IP_OR_SUBNET> --permanent\nfirewall-cmd --zone=trusted --add-port=2181/tcp --permanent\nfirewall-cmd --reload\nWarning: Reloading firewalld applies new firewall rules immediately and can disrupt active network sessions if misconfigured.\n2. Configuration Hardening:\nExplicitly configure 'zookeeper.security.auth_to_local' mapping rules in zoo.cfg to handle all legitimate Kerberos realms and principals, ensuring that canonicalization succeeds for all accepted accounts rather than failing open.\nCaveats:\nNetwork restriction reduces the attack surface from untrusted networks but does not prevent abuse from authenticated clients on authorized networks if cross-realm principals remain unmapped."}, "name": "CVE-2026-100252", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Affected", "package_name": "zookeeper", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:offline_knowledge_portal:1", "fix_state": "Affected", "package_name": "offline-knowledge-portal/rhokp-rhel9", "product_name": "Red Hat Offline Knowledge Portal"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-modelmesh-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-spark-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-rocm64-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-11-04T10:44:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-100252\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-100252\nhttps://lists.apache.org/thread.html/81rdyqlmlp3dtkkqgp8t5080g3b9r2pj"], "statement": "This vulnerability is rated as an Important severity flaw because an authenticated remote user with an unmapped Kerberos principal can claim arbitrary authorization identities, potentially gaining administrative superuser control over cluster data. In Red Hat environments, ZooKeeper typically coordinates infrastructure services across restricted network segments. Exploitation requires client-facing SASL authentication to be active alongside cross-realm trusts or foreign Kerberos identities that lack dedicated auth_to_local translation definitions. Single-realm environments or installations with exhaustive principal mappings are not susceptible to this identity assumption.", "threat_severity": "Important"}

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