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



    Attack Complexity Low

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.63% (77th percentile)
Expand this section
7.5 high
Expand this section
Red Hat
7.5 high

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  • Snyk ID SNYK-JAVA-IONETTY-473214
  • published 26 Sep 2019
  • disclosed 26 Sep 2019
  • credit axeBig

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.