HTTP Request Smuggling Affecting io.netty:netty-all Open this link in a new tab package, versions [,4.1.44.Final)

  • Exploit Maturity

    Proof of concept

  • Attack Complexity


  • Confidentiality


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  • snyk-id


  • published

    27 Jan 2020

  • disclosed

    27 Jan 2020

  • credit


How to fix?

Upgrade io.netty:netty-all to version 4.1.44.Final or higher.


io.netty:netty-all is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

Affected versions of this package are vulnerable to HTTP Request Smuggling due to the package mishandling Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header when using HTTP/1.1. This issue exists because of an incomplete fix for CVE-2019-16869.