# CVE-2026-40355

> Vulnerability · severity: **MEDIUM** (CVSS 5.9).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-40355
- **Published:** 2026-04-28
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.9
- **CWE codes:** CWE-476

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40355

## Citation

> AI Analytics. CVE-2026-40355. Retrieved 2026-07-09 from https://api.ai-analytics.org/cve/CVE-2026-40355. Derived from NIST NVD. Licensed CC0.

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