ngx_http_lua_module (aka lua-nginx-module) before 0.10.16 in OpenResty allows unsafe characters in an argument when using the API to mutate a URI, or a request or response header.
https://security.netapp.com/advisory/ntap-20210507-0005/
https://news.ycombinator.com/item?id=26712562
https://github.com/openresty/lua-nginx-module/pull/1654
https://github.com/openresty/lua-nginx-module/compare/v0.10.15...v0.10.16