CVE-2026-86246

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

Apache Tomcat Native

PublishedSep 23, 2026

First seenSep 23, 2026

Weakness typeCWE-1188CWE-1188

How to fix

Update

apache tomcat_native1.3.9, 2.0.16 or later

Vendor advisories

lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol

Affected products

Product	Affected versions	Fixed in
apache tomcat_native	1.3.0 ≤ v < 1.3.9, 2.0.0 ≤ v < 2.0.16	1.3.9, 2.0.16

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