CVE-2026-40356

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.

PUBLISHED Reserved 2026-04-11 | Published 2026-04-28 | Updated 2026-04-28 | Assigner mitre

Problem types

CWE-191 Integer Underflow (Wrap or Wraparound)

Product status

References

web.mit.edu/kerberos/advisories/

cems.fun/...two-unauthenticated-network-vulnerabilities.html

github.com/...ommit/2e75f0d9362fb979f5fc92829431a590a130929f

cve.org (CVE-2026-40356)

nvd.nist.gov (CVE-2026-40356)

Download JSON