CVE-2026-40355
CVSS Score
5.9
EPSS Score
0.5%
EPSS Percentile
39th
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.
| CWE | CWE-476 |
| Vendor | mit |
| Product | kerberos 5 |
| Published | Apr 28, 2026 |
| Last Updated | Jul 14, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
MIT / Kerberos 5
1.18 < 1.22.3
References
web.mit.edu: https://web.mit.edu/kerberos/advisories/ cems.fun: https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html github.com: https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f cert-portal.siemens.com: https://cert-portal.siemens.com/productcert/html/ssa-082556.html cert-portal.siemens.com: https://cert-portal.siemens.com/productcert/html/ssa-019113.html