CVE-2026-40356
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | mit |
| Product | kerberos 5 |
| Published | Apr 28, 2026 |
| Last Updated | Apr 28, 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