{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21964", "assignerOrgId": "43595867-4340-4103-b7a2-9a5208d29a85", "state": "PUBLISHED", "assignerShortName": "oracle", "dateReserved": "2026-01-05T18:07:34.714Z", "datePublished": "2026-01-20T21:56:33.276Z", "dateUpdated": "2026-01-20T21:56:33.276Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "43595867-4340-4103-b7a2-9a5208d29a85", "shortName": "oracle", "dateUpdated": "2026-01-20T21:56:33.276Z"}, "problemTypes": [{"descriptions": [{"lang": "en-US", "description": "Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server."}]}], "affected": [{"vendor": "Oracle Corporation", "product": "MySQL Server", "versions": [{"version": "8.0.0", "status": "affected", "lessThanOrEqual": "8.0.44", "versionType": "custom"}, {"version": "8.4.0", "status": "affected", "lessThanOrEqual": "8.4.7", "versionType": "custom"}, {"version": "9.0.0", "status": "affected", "lessThanOrEqual": "9.5.0", "versionType": "custom"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndIncluding": "8.0.44"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.4.0", "versionEndIncluding": "8.4.7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndIncluding": "9.5.0"}]}]}], "descriptions": [{"lang": "en-US", "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)."}], "references": [{"url": "https://www.oracle.com/security-alerts/cpujan2026.html", "name": "Oracle Advisory", "tags": ["vendor-advisory"]}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.9, "baseSeverity": "MEDIUM"}}]}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)."}], "id": "CVE-2026-21964", "lastModified": "2026-01-20T22:15:59.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "secalert_us@oracle.com", "type": "Primary"}]}, "published": "2026-01-20T22:15:59.350", "references": [{"source": "secalert_us@oracle.com", "url": "https://www.oracle.com/security-alerts/cpujan2026.html"}], "sourceIdentifier": "secalert_us@oracle.com", "vulnStatus": "Received"}

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