CVE-2025-52520: Apache Tomcat: DoS via integer overflow in multipart file upload

[Mark Thomas <markt () apache org>]

Severity: low

Affected versions:

- Apache Tomcat 11.0.0-M1 through 11.0.8
- Apache Tomcat 10.1.0-M1 through 10.1.42
- Apache Tomcat 9.0.0.M1 through 9.0.106

Description:

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.

Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, 
which fix the issue.

Credit:

Saravana Kumar (finder)

References:

https://lists.apache.org/thread/trqq01bbxw6c92zx69kx2mw2qgmfy0o5
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-52520