CVE-2026-21968 - GitHub Advisory Database (original) (raw)
Vulnerability in the MySQL Server product of Oracle MySQL...
Moderate severity Unreviewed PublishedJan 21, 2026 to the GitHub Advisory Database • Updated Jan 21, 2026
Package
Affected versions
Unknown
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). 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 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).
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-21968
- https://www.oracle.com/security-alerts/cpujan2026.html
Published to the GitHub Advisory Database
Jan 21, 2026
Last updated
Jan 21, 2026