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CVE-2026-4437

gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response

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, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.

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

Metrics

Version Score Severity Vector String
3.1 7.5 High CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Opam packages affected (1)

gettext-stub

Products affected (2)

Product Vendor Version
glibc The GNU C Library 1.14.1
glibc The GNU C Library < publication

References (4)

Credits (4)