CVE-2026-4437

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-4437
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.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://sourceware.org/bugzilla/show_bug.cgi?id=34014 Exploit Issue Tracking Patch
Configurations

Configuration 1 (hide)

cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
History

07 Apr 2026, 18:41

Type Values Removed Values Added
Summary
  • (es) Llamar a gethostbyaddr o gethostbyaddr_r con un nsswitch.conf configurado que especifica el backend DNS de la biblioteca en la GNU C Library versión 2.34 a la versión 2.43 podría, con una respuesta manipulada del servidor DNS configurado, resultar en una violación de la especificación DNS que hace que la aplicación trate una sección que no es de respuesta de la respuesta DNS como una respuesta válida.
References () https://sourceware.org/bugzilla/show_bug.cgi?id=34014 - () https://sourceware.org/bugzilla/show_bug.cgi?id=34014 - Exploit, Issue Tracking, Patch
CPE cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
First Time Gnu
Gnu glibc

23 Mar 2026, 16:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5

20 Mar 2026, 20:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-20 20:16

Updated : 2026-04-07 18:41

NVD link : CVE-2026-4437

Mitre link : CVE-2026-4437

CVE.ORG link : CVE-2026-4437

JSON object : View

Products Affected

gnu

  • glibc
CWE
CWE-125

Out-of-bounds Read