CVE-2026-43515: Apache Tomcat

Critical severity, CVSS 9.1. EPSS: 1.2% chance of exploitation in the next 30 days.

Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Affected products

• Apache Tomcat: from 7.0.0, up to and including 7.0.109; from 8.5.0, up to and including 8.5.100; from 9.0.0, before 9.0.118 (fixed in 9.0.118); from 10.1.0, before 10.1.55 (fixed in 10.1.55); from 11.0.0, before 11.0.22 (fixed in 11.0.22)

Published 2026-05-12. Last modified 2026-06-17.