LOW 3.7 Microsoft
CVE-2026-43964
Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
Microsoft Security Update 2026-May: Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
Affected Products
- azl3 postfix 3.9.0-2 on Azure Linux 3.0
- cbl2 postfix 3.7.4-1 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43964
- https://nvd.nist.gov/vuln/detail/CVE-2026-43964
This low severity vulnerability with a CVSS score of 3.7 was published on 2026-05-12 via Microsoft. Affected: azl3 postfix 3.9.0-2 on Azure Linux 3.0, cbl2 postfix 3.7.4-1 on CBL Mariner 2.0.
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