Eval injection vulnerability in php-gettext 1.0.12 and earlier allows remote attackers to execute arbitrary PHP code via a crafted plural forms header.
https://www.exploit-db.com/exploits/40154/
https://kmkz-web-blog.blogspot.cz/2016/07/advisory-cve-2016-6175.html
https://github.com/NagVis/nagvis/commit/4fe8672a5aec3467da72b5852ca6d283c15adb53