title: DoS via memory leak with WebSocket connections
description: The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.
problem types: CWE-772 Missing Release of Resource after Effective Lifetime
affected:
{
product: Apache Tomcat
vendor: Apache Software Foundation
versions:
status: affected, version: Apache Tomcat 10 10.0.0-M10 to 10.0.11
status: affected, version: Apache Tomcat 10 10.1.0-M1 to 10.1.0-M5
status: affected, version: Apache Tomcat 9 9.0.40 to 9.0.53
status: affected, version: Apache Tomcat 8 8.5.60 to 8.5.71
}