{"id":"CVE-2026-107708","title":"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","summary":"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 tru…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T21:33:42.423","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107708","references":[{"url":"https://github.com/krb5/krb5","label":"disclosure@vulncheck.com"},{"url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676","label":"disclosure@vulncheck.com"},{"url":"https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d","label":"disclosure@vulncheck.com"},{"url":"https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7","label":"disclosure@vulncheck.com"},{"url":"https://github.com/krb5/krb5/pull/1510","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"ingestedAt":"2026-10-08T22:11:53.857Z","slug":"CVE-2026-107708","body":"## Overview\n\nMIT 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}