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.
Published: 2026-10-08
Score: 6.9 Medium
EPSS: n/a
KEV: No
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Remediation

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History

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'}

Subscriptions

Mit Kerberos 5
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

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

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

Link: CVE-2026-107708

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses