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

> CVE-2025-31650: Apache Tomcat: DoS via malformed HTTP/2 PRIORITY_UPDATE frame. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-31650
Last updated: 2026-06-17T09:10:43Z

- Published: 2025-04-28 19:14 UTC · Updated: 2026-06-17 09:10 UTC · Assigner: apache
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 61.3%, 99th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-459

## 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.

## Affected vendors and products

- Apache Software Foundation: Apache Tomcat

## Tracked companies

- [Bitbucket](https://rewindex.com/company/bitbucket.md)
- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-31650)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-31650)
- [https://lists.apache.org/thread/j6zzk0y3yym9pzfzkq5vcyxzz0yzh826](https://lists.apache.org/thread/j6zzk0y3yym9pzfzkq5vcyxzz0yzh826)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-31650 · Markdown: https://rewindex.com/cve/CVE-2025-31650.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-31650 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:25.599Z