IMPORTANT! Update Node.JS to 18.20.1, 20.12.1, 21.7.2 or newer!
Briefly

The team has identified a vulnerability in the http server of the most recent version of Node, where malformed headers can lead to HTTP request smuggling.
Specifically, if a space is placed before a content-length header, it is not interpreted correctly, enabling attackers to smuggle in a second request within the body of the first.
Read at SVR.JS Blog
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