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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-4438

gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

The GNU C Library glibc

Default version status: unaffected

  • 2.34 to ≤ 2.43affected

References