CVE-2026-4438

Published: Mar 20, 2026Modified: Jul 14, 2026

5.4

Vector

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

Exploitability: 2.8 / Impact: 2.5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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 (1)

Products: Gnu: Glibc

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Gnu Glibc	From 2.34 to 2.43

Related CWEs

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.

References (2)

https://sourceware.org/bugzilla/show_bug.cgi?id=34015

Source: 3ff69d7a-14f2-4f67-a097-88dee7810d18

ExploitIssue TrackingPatch

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Timeline

No history available yet.