High [CVE-2026-66299] Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example
This high-severity Apache Software Foundation advisory covers CVE-2026-66299 affecting Apache Tomcat.
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Summary
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.
- 11.0.0-M20 through 11.0.24
- 10.1.24 through 10.1.57
- 9.0.89 through 9.0.120.
- through 9.0.120
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
- 11.0.25
- 10.1.58
- 9.0.121
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
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