---
title: "CVE-2025-31650: Apache Tomcat: DoS via malformed HTTP/2… | CubePath"
description: "Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up…"
language: en
source: https://cubepath.com/security/cve/CVE-2025-31650
---

# CVE-2025-31650: Apache Tomcat: DoS via malformed HTTP/2… | CubePath

## 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.

Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-31650)

## Key data

### CVSS 3.1 High 7.5

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

| Metric                 | Value     | What it means                                                                       |
| ---------------------- | --------- | ----------------------------------------------------------------------------------- |
| Attack vector          | Network   | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.               |
| Privileges required    | None      | No account or privileges are needed.                                                |
| User interaction       | None      | No action from any user is needed.                                                  |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                   |
| Confidentiality impact | None      | No effect on the secrecy of data.                                                   |
| Integrity impact       | None      | No effect on the trustworthiness of data.                                           |
| Availability impact    | High      | Serious or total effect on availability.                                            |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.61322 (61.3% probability)

Percentile

99.2%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA assessment as of May 6, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Automatable

yes

Technical impact

partial

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-459](https://cwe.mitre.org/data/definitions/459.html) Incomplete Cleanup

## Affected products

Products listed in the CVE record, as the CNA published them.

- Apache Tomcat

  - affected: 9.0.76 up to 9.0.102
  - affected: 10.1.10 up to 10.1.39
  - affected: 11.0.0-M2 up to 11.0.5
  - affected: 8.5.90 up to 8.5.100

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [lists.apache.org/thread/j6zzk0y3yym9pzfzkq5vcyxzz0yzh826](https://lists.apache.org/thread/j6zzk0y3yym9pzfzkq5vcyxzz0yzh826) vendor-advisory
- [openwall.com/lists/oss-security/2025/04/28/2](http://www.openwall.com/lists/oss-security/2025/04/28/2)
- [lists.debian.org/debian-lts-announce/2025/07/msg00009.html](https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html)

## Timeline

1. ID reserved Mar 31, 2025
2. Record published Apr 28, 2025
3. Record last updated Nov 3, 2025

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)