CVE-2025-52520: Apache Tomcat Catalina is vulnerable to DoS attack through bypassing of size limits

Quick answers

Is CVE-2025-52520 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-52520 being exploited in the wild.

How severe is CVE-2025-52520?

Low severity, with a CVSS score of 3.1, published 10 July 2025.

Which products and versions are affected?

org.apache.tomcat:tomcat-catalina (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9; org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9.

Is there a fix for CVE-2025-52520?

Yes. org.apache.tomcat:tomcat-catalina (Maven): upgrade to 11.0.9 or later; org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2025-52520?

Check whether you run org.apache.tomcat:tomcat-catalina (Maven) or org.apache.tomcat.embed:tomcat-embed-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

• org.apache.tomcat:tomcat-catalina (Maven): upgrade to 11.0.9 or later

  # set org.apache.tomcat:tomcat-catalina to 11.0.9 in your pom.xml or build.gradle

• org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.9 or later

  # set org.apache.tomcat.embed:tomcat-embed-core to 11.0.9 in your pom.xml or build.gradle

Affected products

• org.apache.tomcat:tomcat-catalina (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9
• org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9

Identifiers

• CVE-2025-52520
• GHSA-wr62-c79q-cv37