{"id":"CVE-2026-86247","summary":"Apache Tomcat Native: Client certificate requirements can be down-graded","details":"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, 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.","modified":"2026-10-31T18:11:57.036165301Z","published":"2026-09-23T12:31:53.210Z","related":["SUSE-SU-2026:23985-1","SUSE-SU-2026:4544-1","SUSE-SU-2026:4546-1","SUSE-SU-2026:4658-1","SUSE-SU-2026:4927-1","openSUSE-SU-2026:11898-1","openSUSE-SU-2026:11899-1","openSUSE-SU-2026:21984-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86247.json","unresolved_ranges":[{"extracted_events":[{"range":[{"introduced":"2.0.0"},{"last_affected":"2.0.15"},{"introduced":"1.3.0"},{"last_affected":"1.3.8"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}],"cna_assigner":"apache","cwe_ids":["CWE-366"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/09/23/33"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86247.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86247"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat-native","events":[{"introduced":"998746966815e1ae105cba9f2681d37cc30249bc"},{"fixed":"bc21d55af8f3aab1321d6e8300fc2d50f5707480"},{"introduced":"39c19afe4a3df7ea4fda778d82dc25bd494a110c"},{"fixed":"6021f72443d74c79167236553a80ef0ed2f96b3a"}],"database_specific":{"extracted_events":[{"cpe":"cpe:2.3:a:apache:tomcat_native:*:*:*:*:*:*:*:*","range":[{"introduced":"1.3.0"},{"fixed":"1.3.9"}],"source":"CPE_RANGE"},{"source":"CPE_RANGE","cpe":"cpe:2.3:a:apache:tomcat_native:*:*:*:*:*:*:*:*","range":[{"introduced":"2.0.0"},{"fixed":"2.0.16"}]}]}}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-86247.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}