CVE-2026-4437

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/20/2026

Last Modified4/7/2026

Sourcenvd

Honeypot Sightings0

Affected Products

gnu:glibc

Weaknesses (CWE)

CWE-125

References

https://sourceware.org/bugzilla/show_bug.cgi?id=34014(3ff69d7a-14f2-4f67-a097-88dee7810d18)

IOC Correlations

No correlations recorded

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