{"id":"CVE-2026-107708","revision":"3e93aee2b1e94943a0741bdc75434590","records":[{"revision":"3e93aee2b1e94943a0741bdc75434590","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107708","aliases":[],"title":"MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC","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.","state":0,"publishedAt":"2026-10-08T20:15:53.534+00:00","modifiedAt":"2026-10-14T01:18:51.696+00:00","affected":[{"ecosystem":"https://github.com/krb5/krb5","name":"krb5","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"MIT\",\n                    \"product\": \"krb5\",\n                    \"collectionURL\": \"https://github.com/krb5/krb5\",\n                    \"packageURL\": \"pkg:github/krb5/krb5\",\n                    \"repo\": \"https://github.com/krb5/krb5\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"1.22.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","score":4.9,"severity":"MEDIUM"}],"references":["https://github.com/krb5/krb5/pull/1510","https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7","https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d","https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676","https://github.com/krb5/krb5","https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107708","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107708","identifiers":["CVE-2026-107708"]},"retained":false,"historicalAffected":[]}],"coverage":[]}