An issue was discovered in OpenResty before 1.15.8.4. ngx_http_lua_subrequest.c allows HTTP request smuggling, as demonstrated by the ngx.location.capture API.
https://www.debian.org/security/2020/dsa-4750
https://security.netapp.com/advisory/ntap-20210129-0002/
https://lists.debian.org/debian-lts-announce/2020/07/msg00014.html
https://github.com/openresty/lua-nginx-module/commit/9ab38e8ee35fc08a57636b1b6190dca70b0076fa