{"id":"CVE-2026-86247","title":"Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.\n\n\n\nThis issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, f…","summary":"Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.\n\n\n\nThis issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, f…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-366"],"vendor":"Apache Software Foundation","product":"Apache Tomcat Native","affected":["apache_tomcat_native >= 2.0.0 <= 2.0.15","apache_tomcat_native >= 1.3.0 <= 1.3.8"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:41.923","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86247","references":[{"url":"https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/33","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-23T15:30:32.467469Z"},"ingestedAt":"2026-09-23T13:24:43.399Z","slug":"CVE-2026-86247","body":"## Overview\n\nRace condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.\n\n\n\nThis issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209775,"id":"CVE-2026-86247","ts":1790180880468,"field":"cvss","old":null,"new":"7.4"},{"seq":209774,"id":"CVE-2026-86247","ts":1790180880468,"field":"severity","old":"none","new":"high"}]}