CVE-2026-86246: Apache Tomcat Native: Insecure OpenSSL options enabled

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-23 · updated 2026-10-06
Weakness: CWE-1188

Description

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 Software Foundation Apache Tomcat Native: from 1.3.0 before 1.3.9; from 2.0.0 before 2.0.16 — fixed in 1.3.9, 2.0.16

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Tomcat Native 1.3.9, 2.0.16. Check the vendor advisory for mitigations.

References

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