CVE-2026-40356

MEDIUM EPSS 36.6%
Published Apr 28, 20262mo ago · Modified Jun 17, 20261w ago
5.9 CVSS 3.1
Medium
Find Similar
Published Apr 28, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
36.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-191

References 3

  • cems.fun https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
  • github.com https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f
  • web.mit.edu https://web.mit.edu/kerberos/advisories/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.