High [CVE-2026-77791] Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack
This high-severity Apache Software Foundation advisory covers CVE-2026-77791 affecting Apache Tomcat.
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Summary
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.
This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121.
The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100.
Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
- 11.0.0-M5 through 11.0.25
- 10.1.8 through 10.1.59
- 9.0.74 through 9.0.121.
- 8.5.88 through 8.5.100.
- through 9.0.121
- through 8.5.100
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 11.0.26
- 10.1.60
- 9.0.122
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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