CVE-2026-21964

Public on 2026-01-20

Modified on 2026-01-29

Description

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).

Severity

Medium

See what this means

CVSS v3 Base Score

4.9

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	mariadb	Not Affected
Amazon Linux 2023	mariadb1011	Not Affected
Amazon Linux 2023	mariadb105	Not Affected

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-21964 Mitre: CVE-2026-21964