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CVE-2026-4438

Updated on 20 Mar 2026

Severity

5.4 Medium severity

Details

CVSS score
5.4
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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.

Details

Affected product:
AlmaLinux 9.2 ESU , TuxCare 9.6 ESU
Affected packages:
glibc @ 2.34 (+1 more)
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.

Fixes