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On 12 April 2026, we received a vulnerability report regarding an HTTP request smuggling vulnerability in HTTP::Server.
The issue was caused by the HTTP request parser prioritizing the Content-Length header over the Transfer-Encoding header, which can lead to desynchronization when a proxy that prioritizes the Transfer-Encoding header sits in front of HTTP::Server for...
We are announcing a new Crystal release 1.20.2 with a couple of regressions fixed.
See the release notes of 1.20.0 for all the changes introduced in Crystal 1.20.
Pre-built packages are available on