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CVE-2026-66299

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · apacheNVD modified 2026-10-24 13:10

Affected (CPE criteria) 8

  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone20:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone21:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone22:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone23:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone24:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone25:*:*:*:*:*:*
  • cpe:2.3:a:apache:tomcat:11.0.0:milestone26:*:*:*:*:*:*

References 2