CVE-2025-52520: Apache Tomcat

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

For some unlikely configurations of multipart upload, an Integer Overflow vulnerability in Apache Tomcat could lead to a DoS via bypassing of size limits. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

Affected products

• Apache Tomcat: from 9.0.0, before 9.0.107 (fixed in 9.0.107); from 10.1.0, before 10.1.43 (fixed in 10.1.43); from 11.0.0, before 11.0.9 (fixed in 11.0.9)

Published 2025-07-10. Last modified 2026-06-17.