CVE-2026-86243: Apache Tomcat Native

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This 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. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Affected products

• Apache Tomcat Native: from 1.3.0, before 1.3.9 (fixed in 1.3.9); from 2.0.0, before 2.0.16 (fixed in 2.0.16)

Published 2026-09-23. Last modified 2026-10-06.