Acceptance of some invalid Transfer-Encoding headers in the HTTP/1 client in net/http before Go 1.17.12 and Go 1.18.4 allows HTTP request smuggling if combined with an intermediate server that also improperly fails to reject the header as invalid.
https://pkg.go.dev/vuln/GO-2022-0525
https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
https://go.googlesource.com/go/+/e5017a93fcde94f09836200bca55324af037ee5f