{"schema":"threatline.record/2","record":{"id":"CVE-2026-107708","aliases":[],"summary":"MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC","details":"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.","categories":["Unclassified"],"product":"krb5","vendor":"MIT","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107708","source_modified_at":"2026-10-14T01:18:51.696Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"krb5","vendor":"MIT","versions":[{"version":"0","lessThanOrEqual":"1.22.2","status":"affected","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":6.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00521,"percentile":0.43407,"score_date":"2026-10-23"},"published_at":"2026-10-08T20:15:53.534Z","modified_at":"2026-10-14T01:18:51.696Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-107708","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-14T01:18:51.696Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-107708","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/krb5/krb5/pull/1510","tags":["issue-tracking","patch"]},{"source":"CVE List","url":"https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7","tags":["patch"]},{"source":"CVE List","url":"https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d","tags":["patch"]},{"source":"CVE List","url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/krb5/krb5","tags":["product"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-14T01:18:41.034364Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-14T01:18:51.696Z","content_hash":"c0450729ffd0f5b5bb07eaf88f3f7e1c0b50ce6f7d8d938bc6889ac0065d323b"}}