{"id":"CVE-2026-21949","details":"Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  Supported versions that are affected are 9.0.0-9.5.0. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).","modified":"2026-08-12T03:51:35.964958555Z","published":"2026-01-20T21:56:29.318Z","database_specific":{"cna_assigner":"oracle","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21949.json","unresolved_ranges":[{"extracted_events":[{"introduced":"9.0.0"},{"last_affected":"9.5.0"}],"source":"AFFECTED_FIELD"},{"source":"CPE_FIELD","extracted_events":[{"introduced":"9.0.0"},{"last_affected":"9.5.0"}]}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21949.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21949"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2026.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mysql/mysql-server","events":[{"introduced":"527c12ed611f3fe072c3043734319edb2c733099"},{"last_affected":"056a391cdc1af9b17b5415aee243483d1bac532d"}],"database_specific":{"extracted_events":[{"introduced":"9.0.0"},{"last_affected":"9.5.0"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21949.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}