CVE-2026-66299

CVE-2026-66299: Apache Tomcat: DoS via WebSocket chat example

Vendor Apache Software Foundation
Product Apache Tomcat
Weakness CWE-400
Published July 28, 2026
Last update July 28, 2026

CVSS base score

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 28, 2026 CVE published
July 28, 2026 Record updated

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