{"id":"CVE-2026-67693","title":"An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)","summary":"An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-367"],"published":"2026-10-08","updated":"2026-10-09","sourceUpdated":"2026-10-09T12:17:11.350","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67693","references":[{"url":"http://gnutls.com","label":"cve@mitre.org"},{"url":"https://gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238","label":"cve@mitre.org"},{"url":"https://gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c#L1119-1178","label":"cve@mitre.org"},{"url":"https://gitlab.com/gnutls/gnutls/-/work_items/1642"}],"tags":["nvd","cve.org","score-dispute"],"ingestedAt":"2026-10-08T20:06:22.189Z","epss":0.00151,"epssPercentile":0.04245,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-19T14:56:39.647163Z"},"scores":{"nvd":7.5,"adp":3.7},"slug":"CVE-2026-67693","body":"## Overview\n\nAn issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":218491,"id":"CVE-2026-67693","ts":1791550651080,"field":"cvss","old":null,"new":"7.5"},{"seq":218490,"id":"CVE-2026-67693","ts":1791550651080,"field":"severity","old":"none","new":"high"}]}