VULNERABILITY INTELLIGENCE

CVE-2026-4438

CVSS score5.4 MEDIUM
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-03-20
Last modified2026-07-14
CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

Weakness classification

  • 3ff69d7a-14f2-4f67-a097-88dee7810d18: CWE-20
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-88

Primary references