NULL Pointer Dereference Affecting libkadm5 package, versions <0:1.21.1-10.el9_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.11% (29th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about NULL Pointer Dereference vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-RHEL9-LIBKADM5-16771658
  • published20 May 2026
  • disclosed28 Apr 2026

Introduced: 28 Apr 2026

CVE-2026-40355  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:9 libkadm5 to version 0:1.21.1-10.el9_8 or higher.
This issue was patched in RHSA-2026:19357.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libkadm5 package and not the libkadm5 package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.

CVSS Base Scores

version 3.1