HTTP Request Smuggling Affecting puma Open this link in a new tab package, versions <4.3.12 >=5.0.0, <5.6.4
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31 Mar 2022
30 Mar 2022
How to fix?
puma to version 4.3.12, 5.6.4 or higher.
puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly concurrent Ruby implementations such as Rubinius and JRuby as well as as providing process worker support to support CRuby well.
Affected versions of this package are vulnerable to HTTP Request Smuggling via the front-end proxy, due to improper validation of the incoming
HTTP request which should match the
RFC7230 standard. This can lead to a disagreement on where a request starts and ends between Puma and the frontend proxy.
Note: When deploying a proxy in front of
Puma, the user should turn on all functionality to make sure that the request matches the