MEDIUM 5.9 Microsoft

CVE-2026-4437

gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response

Microsoft Security Update 2026-Aug: gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response

Affected Products

azl3 glibc 2.38-19 on Azure Linux 3.0
azl3 glibc 2.38-18 on Azure Linux 3.0
cbl2 glibc 2.35-10 on CBL Mariner 2.0
cbl2 glibc 2.35-10

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4437
https://nvd.nist.gov/vuln/detail/CVE-2026-4437

Published: 2026-08-06 · Source: Microsoft · Feed updated: 2026-08-10

This medium severity vulnerability with a CVSS score of 5.9 was published on 2026-08-06 via Microsoft. Affected: azl3 glibc 2.38-19 on Azure Linux 3.0, azl3 glibc 2.38-18 on Azure Linux 3.0, cbl2 glibc 2.35-10 on CBL Mariner 2.0 and 1 more.

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