CVE-2026-40356

MEDIUM

5.9

Description

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/28/2026

Last Modified4/28/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-191

References

https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html(cve@mitre.org)

https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f(cve@mitre.org)

https://web.mit.edu/kerberos/advisories/(cve@mitre.org)

IOC Correlations

No correlations recorded

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