CVE-2026-21863

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21863", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-01-05T16:44:16.367Z", "datePublished": "2026-02-23T19:41:28.783Z", "dateUpdated": "2026-07-15T01:19:48.777Z"}, "containers": {"cna": {"title": "Malformed Valkey Cluster bus message can lead to Remote DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq"}], "affected": [{"vendor": "valkey-io", "product": "valkey", "versions": [{"version": "< 7.2.12", "status": "affected"}, {"version": ">= 8.0.0, < 8.0.7", "status": "affected"}, {"version": ">= 8.1.0, < 8.1.6", "status": "affected"}, {"version": ">= 9.0.0, < 9.0.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-23T19:41:28.783Z"}, "descriptions": [{"lang": "en", "value": "Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs."}], "source": {"advisory": "GHSA-c677-q3wr-gggq", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-25T14:58:12.583553Z", "id": "CVE-2026-21863", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-02-25T14:58:41.277Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10.1"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el10_1", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el10_0", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:enterprise_linux:9"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el9_7", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:hummingbird:1"], "defaultStatus": "affected", "packageName": "valkey-main", "product": "Red Hat Hardened Images", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "9.0.3-1.2.hum1", "versionType": "rpm"}]}], "datePublic": "2026-02-23T19:41:28.783Z", "descriptions": [{"lang": "en", "value": "A flaw was found in Valkey, a distributed key-value database. A malicious actor with access to the Valkey clusterbus port can exploit an input validation vulnerability by sending a specially crafted invalid clusterbus packet. This lack of validation for clusterbus ping extension packets can lead to an out-of-bounds read. Consequently, this may cause the system to crash, resulting in a Denial of Service (DoS)."}], "metrics": [{"other": {"content": {"namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS"}], "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "description": "Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "references": [{"tags": ["vdb-entry", "x_refsource_REDHAT"], "url": "https://access.redhat.com/security/cve/CVE-2026-21863"}, {"name": "RHBZ#2442026", "tags": ["issue-tracking", "x_refsource_REDHAT"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442026"}, {"tags": ["x_sadp-csaf-vex"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.json"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:5445"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:3443"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:3507"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:8753"}], "solutions": [{"lang": "en", "value": "RHSA-2026:5445: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"}, {"lang": "en", "value": "RHSA-2026:3443: Red Hat Enterprise Linux AppStream (v. 10)"}, {"lang": "en", "value": "RHSA-2026:3507: Red Hat Enterprise Linux AppStream (v. 9)"}, {"lang": "en", "value": "RHSA-2026:8753: Red Hat Hardened Images"}], "timeline": [{"lang": "en", "time": "2026-02-23T21:03:12.281Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-02-23T19:41:28.783Z", "value": "Made public."}], "title": "valkey: Valkey: Denial of Service via invalid clusterbus packet", "workarounds": [{"lang": "en", "value": "To mitigate this issue, restrict network access to the Valkey cluster bus port. Configure network access control lists (ACLs) or firewall rules to ensure that only trusted hosts can connect to the cluster bus port. This limits the attack surface by preventing unauthorized actors from sending malicious clusterbus packets."}], "x_adpType": "supplier", "x_generator": {"engine": "sadp-cli 1.0.0"}, "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:19:48.777Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "valkey: Valkey: Denial of Service via invalid clusterbus packet", "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": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:10.1"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux AppStream (v. 10)", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9::appstream"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux AppStream (v. 9)", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:hummingbird:1"], "vendor": "Red Hat", "product": "Red Hat Hardened Images", "defaultStatus": "affected"}], "timeline": [{"lang": "en", "time": "2026-02-23T21:03:12.281Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-02-23T19:41:28.783Z", "value": "Made public."}], "solutions": [{"lang": "en", "value": "RHSA-2026:5445: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"}, {"lang": "en", "value": "RHSA-2026:3443: Red Hat Enterprise Linux AppStream (v. 10)"}, {"lang": "en", "value": "RHSA-2026:3507: Red Hat Enterprise Linux AppStream (v. 9)"}, {"lang": "en", "value": "RHSA-2026:8753: Red Hat Hardened Images"}], "x_adpType": "supplier", "datePublic": "2026-02-23T19:41:28.783Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-21863", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442026", "name": "RHBZ#2442026", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.json", "tags": ["x_sadp-csaf-vex"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:5445", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:3443", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:3507", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:8753", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "To mitigate this issue, restrict network access to the Valkey cluster bus port. Configure network access control lists (ACLs) or firewall rules to ensure that only trusted hosts can connect to the cluster bus port. This limits the attack surface by preventing unauthorized actors from sending malicious clusterbus packets."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in Valkey, a distributed key-value database. A malicious actor with access to the Valkey clusterbus port can exploit an input validation vulnerability by sending a specially crafted invalid clusterbus packet. This lack of validation for clusterbus ping extension packets can lead to an out-of-bounds read. Consequently, this may cause the system to crash, resulting in a Denial of Service (DoS)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-06-30T02:45:47.402Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-21863", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-02-25T14:58:12.583553Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-25T14:58:34.933Z"}}], "cna": {"title": "Malformed Valkey Cluster bus message can lead to Remote DoS", "source": {"advisory": "GHSA-c677-q3wr-gggq", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "valkey-io", "product": "valkey", "versions": [{"status": "affected", "version": "< 7.2.12"}, {"status": "affected", "version": ">= 8.0.0, < 8.0.7"}, {"status": "affected", "version": ">= 8.1.0, < 8.1.6"}, {"status": "affected", "version": ">= 9.0.0, < 9.0.2"}]}], "references": [{"url": "https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq", "name": "https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq", "tags": ["x_refsource_CONFIRM"]}], "descriptions": [{"lang": "en", "value": "Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-23T19:41:28.783Z"}}}, "cveMetadata": {"cveId": "CVE-2026-21863", "state": "PUBLISHED", "dateUpdated": "2026-06-30T02:45:47.402Z", "dateReserved": "2026-01-05T16:44:16.367Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-02-23T19:41:28.783Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "valkey", "vendor": "valkey-io", "versions": [{"status": "affected", "version": "< 7.2.12"}, {"status": "affected", "version": ">= 8.0.0, < 8.0.7"}, {"status": "affected", "version": ">= 8.1.0, < 8.1.6"}, {"status": "affected", "version": ">= 9.0.0, < 9.0.2"}]}], "source": "security-advisories@github.com"}, {"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10.1"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el10_1", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el10_0", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:enterprise_linux:9"], "defaultStatus": "affected", "packageName": "valkey", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:8.0.7-1.el9_7", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:hummingbird:1"], "defaultStatus": "affected", "packageName": "valkey-main", "product": "Red Hat Hardened Images", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "9.0.3-1.2.hum1", "versionType": "rpm"}]}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A7DFDB2-5FDE-4F69-9B9E-7ED6D910EF76", "versionEndExcluding": "7.2.12", "vulnerable": true}, {"criteria": "cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*", "matchCriteriaId": "2375C3CF-6580-4EA0-AA6A-A92198CB7E1F", "versionEndExcluding": "8.0.7", "versionStartIncluding": "8.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*", "matchCriteriaId": "03050B63-5660-4DFF-B6AC-3E701B9D199D", "versionEndExcluding": "8.1.6", "versionStartIncluding": "8.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*", "matchCriteriaId": "315880B4-E0D2-4366-8E7B-2B97D82BA92E", "versionEndExcluding": "9.0.2", "versionStartIncluding": "9.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs."}, {"lang": "es", "value": "Valkey es una base de datos distribuida de clave-valor. Antes de las versiones 9.0.2, 8.1.6, 8.0.7 y 7.2.12, un actor malicioso con acceso al puerto clusterbus de Valkey puede enviar un paquete inv\u00e1lido que puede causar una lectura fuera de l\u00edmites, lo que podr\u00eda resultar en la ca\u00edda del sistema. El c\u00f3digo de procesamiento de paquetes clusterbus de Valkey no valida que un paquete de extensi\u00f3n ping de clusterbus est\u00e9 ubicado dentro del b\u00fafer del paquete clusterbus antes de intentar leerlo. Las versiones 9.0.2, 8.1.6, 8.0.7 y 7.2.12 solucionan el problema. Como una mitigaci\u00f3n adicional, no exponga la conexi\u00f3n del bus de cl\u00faster directamente a los usuarios finales y proteja la conexi\u00f3n con sus propias ACL de red."}], "id": "CVE-2026-21863", "lastModified": "2026-07-15T02:18:31.490", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21863", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-25T14:58:12.583553Z", "version": "2.0.3"}}]}, "published": "2026-02-23T20:28:53.853", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:3443"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:3507"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5445"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:8753"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-21863"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442026"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21863.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "valkey: Valkey: Denial of Service via invalid clusterbus packet", "id": "2442026", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442026"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in Valkey, a distributed key-value database. A malicious actor with access to the Valkey clusterbus port can exploit an input validation vulnerability by sending a specially crafted invalid clusterbus packet. This lack of validation for clusterbus ping extension packets can lead to an out-of-bounds read. Consequently, this may cause the system to crash, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, restrict network access to the Valkey cluster bus port. Configure network access control lists (ACLs) or firewall rules to ensure that only trusted hosts can connect to the cluster bus port. This limits the attack surface by preventing unauthorized actors from sending malicious clusterbus packets."}, "name": "CVE-2026-21863", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-23T19:41:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-21863\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21863\nhttps://github.com/valkey-io/valkey/security/advisories/GHSA-c677-q3wr-gggq"], "statement": "This issue is rated High severity by Red Hat Product Security, because Valkey is commonly deployed as a network-accessible service or embedded within applications that accept remote input over standard network interfaces. In such environments, a remote attacker can trigger the vulnerability by sending specially crafted data to the service. Successful exploitation results in a service crash, leading to a denial-of-service condition. Although no confidentiality or integrity impacts are observed, the ability to repeatedly crash the service over the network justifies a High availability impact rating.\nThis vulnerability affects Valkey deployments where the cluster bus connection is exposed.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.2.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.0.0,8.0.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.1.0,8.1.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.0.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "valkey", "source": "cna", "vendor": "valkey-io"}, "product": "valkey", "vendor": "valkey-io"}], "analysis": {"en": {"generated_at": "2026-04-17T16:15:50.648567+00:00", "value": {"mitigation_remediation": ["Upgrade Valkey to at least 9.0.2, 8.1.6, 8.0.7, or 7.2.12, depending on your environment.", "Reconfigure the clusterbus interface so it is not publicly exposed; restrict access to trusted peers only, using firewall or network ACLs.", "Apply network ACLs or firewall rules to block unauthorized traffic to the clusterbus port, ensuring that only legitimate cluster nodes can communicate."], "summary": {"action": "Immediate Patch", "impact": "Remote Denial of Service"}, "threat_synthesis": {"affected_systems": "The issue affects Valkey versions prior to 9.0.2, 8.1.6, 8.0.7, and 7.2.12. The vulnerable component is the clusterbus packet processing code in the distributed key\u2011value database developed by Valkey.io.\n", "description_and_impact": "A malformed message sent to the Valkey clusterbus can trigger an out of bounds read, potentially disrupting the server and causing a system crash. This vulnerability allows an attacker with access to the clusterbus port to send crafted packets that the server processes without proper bounds checking, leading to remote denial of service.\n", "risk_and_exploitability": "The CVSS score is 7.5, indicating a high severity. The EPSS score is less than 1%, implying a very low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Attackers who can reach the clusterbus port\u2014either locally or over an exposed network\u2014might send a malicious packet to induce a crash, though no public exploitation code is reported.\n"}}}}, "created": "2026-02-24T09:55:27.626513+00:00", "updated": "2026-04-17T16:30:05.819671+00:00", "vendors": ["valkey-io", "valkey-io$PRODUCT$valkey"]}