{"id":"CVE-2026-86243","title":"Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash.\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","summary":"Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash.\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. E…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-126"],"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":"2026-09-23T19:19:41.600","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86243","references":[{"url":"https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3ov8o557","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/31","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T15:28:53.132953Z"},"ingestedAt":"2026-09-23T13:24:43.398Z","slug":"CVE-2026-86243","body":"## Overview\n\nBuffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash.\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. Earlier, unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 1.3.9 or 2.0.16, which fix 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":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209771,"id":"CVE-2026-86243","ts":1790180880254,"field":"cvss","old":null,"new":"7.5"},{"seq":209770,"id":"CVE-2026-86243","ts":1790180880254,"field":"severity","old":"none","new":"high"}]}