CVE-2026-40355
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductMit Kerberos
PublishedApr 28, 2026
First seenApr 28, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mit kerberos_5 | 1.18.0 ≤ v ≤ 1.22.2 | — |
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