It was discovered that Phusion Passenger incorrectly handled a file path in
the application root folder. An attacker could possibly use this issue to
read arbitrary files. (CVE-2017-16355)
It was discovered that Phusion Passenger had a race condition in the nginx
module that could be used to perform a symlink attack. An attacker could
possibly use this issue to escalate privileges. (CVE-2018-12029)