Smarty 3 before 3.1.32 is vulnerable to a PHP code injection when calling fetch() or display() functions on custom resources that does not sanitize template name.
https://www.debian.org/security/2018/dsa-4094
https://lists.debian.org/debian-lts-announce/2018/02/msg00000.html
https://lists.debian.org/debian-lts-announce/2018/01/msg00023.html
https://github.com/smarty-php/smarty/blob/master/change_log.txt