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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-66299

Apache Tomcat: DoS via WebSocket chat example

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Apache Software Foundation Apache Tomcat

Default version status: unaffected

  • 11.0.0-M20 to ≤ 11.0.24affected
  • 10.1.24 to ≤ 10.1.57affected
  • 9.0.89 to ≤ 9.0.120affected
  • 0 to ≤ 8.5.100unaffected

References