Debian: DSA-5009-1 Critical: Tomcat9 Memory Leak Threat

Apache Tomcat, the servlet and JSP engine, did not properly release an HTTP
upgrade connection for WebSocket connections once the WebSocket connection was
closed. This created a memory leak that, over time, could lead to a denial of
service via an OutOfMemoryError.

For the stable distribution (bullseye), this problem has been fixed in
version 9.0.43-2~deb11u3.

We recommend that you upgrade your tomcat9 packages.

For the detailed security status of tomcat9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/tomcat9

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/