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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
MIT Kerberos 5
Default version status: unaffected
1.18 to < 1.22.3affected
References
- https://web.mit.edu/kerberos/advisories/ ↗
- https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html ↗
- https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗