CVE-2026-86248: Apache Software Foundation Apache Tomcat

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Affected products

• Apache Software Foundation Apache Tomcat: from 11.0.0-M14, up to and including 11.0.25; from 10.1.22, up to and including 10.1.59; from 9.0.92, up to and including 9.0.121

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