Description

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read 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, possibly causing the process to terminate in parse_message.

INFO

Published Date :

2026-04-28T00:00:00.000Z

Last Modified :

2026-04-28T13:10:24.842Z

Source :

mitre
AFFECTED PRODUCTS

The following products are affected by CVE-2026-40356 vulnerability.

Vendors Products
Mit
  • Kerberos 5
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40356.

URL Resource
https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html cve-icon cve-icon cve-icon
https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f cve-icon cve-icon cve-icon
https://web.mit.edu/kerberos/advisories/ cve-icon cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact