MEDIUM 4.9 Microsoft
CVE-2026-34267
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. 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).
Microsoft Security Update 2026-Apr: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. 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).
Affected Products
- azl3 mysql 8.0.45-2 on Azure Linux 3.0
- cbl2 mysql 8.0.45-3 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34267
- https://nvd.nist.gov/vuln/detail/CVE-2026-34267
This medium severity vulnerability with a CVSS score of 4.9 was published on 2026-04-14 via Microsoft. Affected: azl3 mysql 8.0.45-2 on Azure Linux 3.0, cbl2 mysql 8.0.45-3 on CBL Mariner 2.0.
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