The HTTP/1 client does not fully validate the contents of the Host header. A maliciously crafted Host header can inject additional headers or entire requests. With fix, the HTTP/1 client now refuses to send requests containing an invalid Request.Host or Request.URL.Host value.
https://security.netapp.com/advisory/ntap-20230814-0002/
https://security.gentoo.org/glsa/202311-09
https://pkg.go.dev/vuln/GO-2023-1878