CVE-2026-66299
Last modified
CVE-2026-66299 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
Description
Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Apache | Tomcat | >= 9.0.89, < 9.0.121 | — |
| Apache | Tomcat | >= 10.1.24, < 10.1.58 | — |
| Apache | Tomcat | >= 11.0.1, < 11.0.25 | — |
| Apache | Tomcat | 11.0.0 | Milestone20 |
References
- https://lists.apache.org/thread/8owczcc1o8qw1rxmg9gvfk4w2jnh4l5kMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/07/28/25Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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