GHSA-qxf4-chvg-4r8r Potential HTTP request smuggling in Apache Tomcat

• Maven org.apache.tomcat.embed:tomcat-embed-core: < 7.0.100 → fixed in 7.0.100 • Maven org.apache.tomcat.embed:tomcat-embed-core: >= 8.0.0, < 8.5.51 → fixed in 8.5.51 • Maven org.apache.tomcat.embed:tomcat-embed-core: >= 9.0.0, < 9.0.31 → fixed in 9.0.31 • Maven org.apache.tomcat:tomcat: < 7.0.100 → fixed in 7.0.100 • Maven org.apache.tomcat:tomcat: >= 8.0.0, < 8.5.51 → fixed in 8.5.51 • Maven org.apache.tomcat:tomcat: >= 9.0.0, < 9.0.31 → fixed in 9.0.31

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led 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.