CVE-2026-86246: Apache Tomcat Native

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX. 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 2.0.16 or 1.3.9, 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.