HTTP Request Smuggling Affecting io.netty:netty-all package, versions [,4.1.42.Final)

  • Exploit Maturity

    Proof of concept

  • Attack Complexity


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  • snyk-id


  • published

    26 Sep 2019

  • disclosed

    26 Sep 2019

  • credit


How to fix?

Upgrade io.netty:netty-all to version 4.1.42.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. Netty mishandles whitespace before the colon in HTTP headers such as a Transfer-Encoding : chunked line. This can lead to HTTP request smuggling where an attacker can bypass security controls, gain unauthorized access to sensitive data, and directly compromise other application users.