CVE-2026-65927: Apache Tomcat

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

Affected products

• Apache Tomcat: from 8.5.0, before 9.0.121 (fixed in 9.0.121); from 10.1.0, before 10.1.58 (fixed in 10.1.58); from 11.0.0, before 11.0.25 (fixed in 11.0.25)

Published 2026-08-25. Last modified 2026-08-27.