CVE-2026-40355

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.

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

Problem types

CWE-476 NULL Pointer Dereference

Product status

References

web.mit.edu/kerberos/advisories/

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

github.com/...ommit/2e75f0d9362fb979f5fc92829431a590a130929f

cve.org (CVE-2026-40355)

nvd.nist.gov (CVE-2026-40355)

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