CVE-2026-40355

MEDIUM

MIT Kerberos 5 1.18-<1.22.3 - Unauthenticated NULL Pointer Dereference via NegoEx Mechanism

Title source: llm
STIX 2.1

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.

References (5)

Core 5

Scores

CVSS v3 5.9
EPSS 0.0061
EPSS Percentile 45.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (2)
MIT/Kerberos 5 1.18 - 1.22.3
mit/kerberos_5 1.18.0 - 1.22.2
Published Apr 28, 2026
Tracked Since Apr 28, 2026