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.

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Tue, 28 Apr 2026 06:30:00 +0000

Type Values Removed Values Added
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.
First Time appeared Mit
Mit kerberos 5
Weaknesses CWE-191
CPEs cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
Vendors & Products Mit
Mit kerberos 5
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-28T05:23:13.610Z

Reserved: 2026-04-11T00:00:00.000Z

Link: CVE-2026-40356

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-28T07:16:03.197

Modified: 2026-04-28T07:16:03.197

Link: CVE-2026-40356

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-28T07:30:26Z

Weaknesses