CVE-2026-4438

A flaw was found in the GNU C library (glibc). When applications use the gethostbyaddr or gethostbyaddr_r functions with a nsswitch.conf configuration that specifies glibc's DNS backend, the library may return an invalid DNS hostname. This violates the DNS specification and could lead to applications receiving incorrect hostname information, potentially impacting network operations or security decisions.

This is a LOW impact flaw where glibc's gethostbyaddr and gethostbyaddr_r functions may return an invalid DNS hostname. This occurs when applications use a nsswitch.conf configuration that specifies glibc's DNS backend. This could lead to applications receiving incorrect hostname information, potentially affecting network operations or security decisions on Red Hat Enterprise Linux and OpenShift Container Platform.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.