CVE-2025-31650 PoC — Apache Tomcat: DoS via malformed HTTP/2 PRIORITY_UPDATE frame

Source

https://github.com/absholi7ly/TomcatKiller-CVE-2025-31650

Associated Vulnerability

Title: Apache Tomcat: DoS via malformed HTTP/2 PRIORITY_UPDATE frame (CVE-2025-31650)
Description:Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service. This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.90 though 8.5.100. Users are recommended to upgrade to version 9.0.104, 10.1.40 or 11.0.6 which fix the issue.

Description

A tool designed to detect the vulnerability **CVE-2025-31650** in Apache Tomcat (versions 10.1.10 to 10.1.39)

Readme

# TomcatKiller-CVE-2025-31650
A tool designed to detect the vulnerability **CVE-2025-31650** in Apache Tomcat (versions 10.1.10 to 10.1.39)
This vulnerability allows an attacker to trigger a **memory leak** by sending specially crafted HTTP/2 requests with invalid priority headers, leading to a denial-of-service (DoS) condition via an `OutOfMemoryError`.

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![TomcatKiller](Poc.png)

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