Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.apache.tomcat:tomcat(Maven) | 11.0.0-M1 | 11.0.0-M12 | N/A |
| org.apache.tomcat:tomcat(Maven) | 10.1.0-M1 | 10.1.14 | N/A |
| org.apache.tomcat:tomcat(Maven) | 9.0.0-M1 | 9.0.81 | N/A |
| org.apache.tomcat:tomcat(Maven) | 8.5.0 | 8.5.94 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 11.0.0-M1 | 11.0.0-M12 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 10.1.0-M1 | 10.1.14 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 9.0.0-M1 | 9.0.81 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 8.5.0 | 8.5.94 | N/A |
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