Please bump the nginx version in the Funtoo portage overlay from 1.11.10 to 1.12.1 or higher. as there exists a potential for integer overflow in the range filter.
http://mailman.nginx.org/pipermail/nginx-announce/2017/000200.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7529

Also consider masking vulnerable versions. Workaround for vulnerability is to use below configuration:

max_ranges 1;