HTTP Request Smuggling Affecting org.apache.tomcat.embed:tomcat-embed-core package, versions [10.0.0-M1,10.0.0-M8) [9.0.0.M5, 9.0.38) [8.5.1, 8.5.58)

  • Attack Complexity


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  • snyk-id


  • published

    13 Oct 2020

  • disclosed

    13 Oct 2020

  • credit


How to fix?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to version 10.0.0-M8, 9.0.38, 8.5.58 or higher.


org.apache.tomcat.embed:tomcat-embed-core is a Core Tomcat implementation.

Affected versions of this package are vulnerable to HTTP Request Smuggling. If an HTTP/2 client connecting to Apache Tomcat exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.