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CVE-2026-4438

gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames

Published: 3/20/2026 Last updated: 7/14/2026 Reserved: 3/19/2026

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.

CNA assigner: glibc (3ff69d7a-14f2-4f67-a097-88dee7810d18) Requested by: n/a

Metrics

Version Score Severity Vector String
3.1 5.4 Medium CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Opam packages affected (1)

gettext-stub

Products affected (2)

Product Vendor Version
glibc The GNU C Library Apache Camel 2.22.x, 2.23.x, 2.24.x, 2.25.0, 3.0.0 up to 3.1.0
glibc The GNU C Library 1.00(AAWB.10)C0

References (4)

Credits (2)