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.
Metrics
Affected Vendors & Products
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History
Wed, 14 Oct 2026 02:30:00 +0000
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ssvc
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Fri, 09 Oct 2026 00:15:00 +0000
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threat_severity
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threat_severity
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Thu, 08 Oct 2026 20:30:00 +0000
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| 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 |
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| Weaknesses | CWE-476 | |
| CPEs | cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mit
Mit kerberos 5 |
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| References |
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| Metrics |
cvssV3_1
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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
Updated: 2026-10-14T01:18:47.295Z
Status : Awaiting Analysis
Published: 2026-10-08T21:17:52.223
Modified: 2026-10-14T02:16:57.580
Link: CVE-2026-107708