In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn't handle Content-Length and Transfer-Encoding properly or doesn't handle \n as a headers separator.
{ "versions": [ { "introduced": "0" }, { "fixed": "1.3.0" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-5207.json"