GHSA-767j-jfh2-jvrc Potential HTTP request smuggling in Apache Tomcat

• Maven org.apache.tomcat.embed:tomcat-embed-core: >= 7.0.98, < 7.0.100 → fixed in 7.0.100 • Maven org.apache.tomcat.embed:tomcat-embed-core: >= 8.5.48, < 8.5.51 → fixed in 8.5.51 • Maven org.apache.tomcat.embed:tomcat-embed-core: >= 9.0.28, < 9.0.31 → fixed in 9.0.31 • Maven org.apache.tomcat:tomcat: >= 7.0.98, < 7.0.100 → fixed in 7.0.100 • Maven org.apache.tomcat:tomcat: >= 8.5.48, < 8.5.51 → fixed in 8.5.51 • Maven org.apache.tomcat:tomcat: >= 9.0.28, < 9.0.31 → fixed in 9.0.31

The refactoring present in Apache Tomcat versions 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.