Puma 3.0.0-3.12.5 and 4.0.0-4.3.3 - HTTP Request Smuggling via Invalid Transfer-Encoding Header
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.