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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.

🗓️ 01 May 2026 08:03:54Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 7 Views

CVE-2026-40356 affects Microsoft products.

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Detection

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03 Jun 2026 08:43Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.9
EPSS0.0046
SSVC
7