Several security vulnerabilities have been discovered in the Tomcat servlet and JSP engine. CVE-2023-46589 Tomcat 9 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. CVE-2024-24549 Denial of Service due to improper input validation vulnerability for HTTP/2. When processing an HTTP/2 request, if the request exceeded any of the configured limits for headers, the associated HTTP/2 stream was not reset until after all of the headers had been processed. CVE-2024-23672 Denial of Service via incomplete cleanup vulnerability. It was possible for WebSocket clients to keep WebSocket connections open leading to increased resource consumption.