CVE-2020-5207
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.
Date published : 2020-01-27
https://github.com/ktorio/ktor/security/advisories/GHSA-xrr9-rh8p-433v