Apache Tomcat Denial of Service via invalid HTTP priority header
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-31650US | high7.5 | Exploit | ||
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 whic… | ||||
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2025/04/28/2WEB
- https://github.com/apache/tomcatPACKAGE
- https://github.com/apache/tomcat/commit/1eef1dc459c45f1e421d8bd25ef340fc1cc34edcWEB
- https://github.com/apache/tomcat/commit/40ae788c2e64d018b4e58cd4210bb96434d0100dWEB
- https://github.com/apache/tomcat/commit/75554da2fc5574862510ae6f0d7b3d78937f1d40WEB
- https://github.com/apache/tomcat/commit/8cc3b8fb3f2d8d4d6a757e014f19d1fafa948a60WEB
- https://github.com/apache/tomcat/commit/b7674782679e1514a0d154166b1d04d38aaac4a9WEB
- https://github.com/apache/tomcat/commit/b98e74f517b36929f4208506e5adad22cb767baaWEB
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