CVE-2026-77791 Apache Tomcat - DoS via busy wait during WebSocket close
Severity: Important Vendor: The Apache Software Foundation Versions Affected: Apache Tomcat 11.0.0-M5 to 11.0.25 Apache Tomcat 10.1.8 to 10.1.59 Apache Tomcat 9.0.74 to 9.0.121 Description: A busy wait during sending of WebSocket close message enabled a DoS attack. Mitigation: Users of the affected versions should apply one of the following mitigations: - Remove the examples web application - Upgrade to Apache Tomcat 11.0.26 - Upgrade to Apache Tomcat 10.1.60 - Upgrade to Apache Tomcat 9.0.122 History: 2026-09-23 Original advisory References: [1] https://tomcat.apache.org/security-11.html [2] https://tomcat.apache.org/security-10.html [3] https://tomcat.apache.org/security-9.html --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
