Header smuggling is not as cool as budgie smuggling but lighttp was allowing it anyway.
lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.\n\nSuccessful exploitation may allow an attacker to:\n\n * Bypass access control rules\n * Inject unsafe input into backend logic that trusts request headers\n * Execute HTTP Request Smuggling attacks under some conditions\n\n\nThis issue affects lighttpd1.4.80
https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1





