VULNERABILITY INTELLIGENCE

CVE-2026-4437

CVSS score7.5 HIGH
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-03-20
Last modified2026-07-14
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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, 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.

Weakness classification

  • 3ff69d7a-14f2-4f67-a097-88dee7810d18: CWE-125

Primary references