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CVE-2026-40356 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html	[email protected]	ExploitThird Party AdvisoryPatch
https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f	[email protected]	Patch
https://web.mit.edu/kerberos/advisories/	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-191	Integer Underflow (Wrap or Wraparound)	[email protected]

Affected Products

Product	Versions
mit kerberos 5	>= 1.18.0, <= 1.22.2
CPE cpe:2.3:a:mit:kerberos_5:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jul 8, 2026	Initial Analysis	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Apr 28, 2026	New CVE Received	[email protected]