{"id":"CVE-2026-107708","published":"2026-10-08T21:17:52.223","lastModified":"2026-10-14T02:16:57.580","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.","cvssScore":4.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-476"],"vendors":[],"products":[],"references":[{"url":"https://github.com/krb5/krb5","tags":[]},{"url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676","tags":[]},{"url":"https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d","tags":[]},{"url":"https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7","tags":[]},{"url":"https://github.com/krb5/krb5/pull/1510","tags":[]},{"url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac","tags":[]}],"exploitRefs":[{"url":"https://github.com/krb5/krb5","tags":[]},{"url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676","tags":[]},{"url":"https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d","tags":[]},{"url":"https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7","tags":[]},{"url":"https://github.com/krb5/krb5/pull/1510","tags":[]}],"hasPoc":true,"ai":null}