The refactoring present in Apache Tomcat 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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 7.0.98 | 7.0.100 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 8.5.48 | 8.5.51 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 9.0.28 | 9.0.31 | N/A |
| org.apache.tomcat:tomcat(Maven) | 7.0.98 | 7.0.100 | N/A |
| org.apache.tomcat:tomcat(Maven) | 8.5.48 | 8.5.51 | N/A |
| org.apache.tomcat:tomcat(Maven) | 9.0.28 | 9.0.31 | N/A |
CVSS Metrics
