MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.
History

Wed, 14 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 08 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Description MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.
Title MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC
First Time appeared Mit
Mit kerberos 5
Weaknesses CWE-476
CPEs cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
Vendors & Products Mit
Mit kerberos 5
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-08T20:15:53.534Z

Updated: 2026-10-14T01:18:51.696Z

Reserved: 2026-10-08T16:52:24.550Z

Link: CVE-2026-107708

cve-icon Vulnrichment

Updated: 2026-10-14T01:18:47.295Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T21:17:52.223

Modified: 2026-10-14T02:16:57.580

Link: CVE-2026-107708

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T20:15:53Z

Links: CVE-2026-107708 - Bugzilla