HTTP Request Smuggling Affecting io.netty:netty-codec-http package, versions [,4.1.44.Final)



    Exploit Maturity Proof of concept
    Attack Complexity Low
    Confidentiality High
Expand this section
7.5 high

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-JAVA-IONETTY-543490
  • published 27 Jan 2020
  • disclosed 27 Jan 2020
  • credit Unknown

How to fix?

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


io.netty:netty-codec-http is a 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.