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).

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Wed, 11 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
Title mysql: Optimizer unspecified vulnerability (CPU Jan 2026)
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 21 Jan 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 20 Jan 2026 22:15:00 +0000

Type Values Removed Values Added
Description 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).
First Time appeared Oracle
Oracle mysql Server
CPEs cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle mysql Server
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-01-21T15:17:33.458Z

Reserved: 2026-01-05T18:07:34.712Z

Link: CVE-2026-21950

cve-icon Vulnrichment

Updated: 2026-01-21T15:17:26.891Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-20T22:15:57.993

Modified: 2026-01-29T15:28:59.573

Link: CVE-2026-21950

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-20T00:00:00Z

Links: CVE-2026-21950 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses