Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.45 and 4.1.1, template authors could inject php code by choosing a malicious {block} name or {include} file name. Sites that cannot fully trust template authors should upgrade to versions 3.1.45 or 4.1.1 to receive a patch for this issue. There are currently no known workarounds.
https://www.debian.org/security/2022/dsa-5151
https://security.gentoo.org/glsa/202209-09
https://lists.debian.org/debian-lts-announce/2022/05/msg00044.html
https://github.com/smarty-php/smarty/security/advisories/GHSA-634x-pc3q-cf4c
https://github.com/smarty-php/smarty/releases/tag/v4.1.1
https://github.com/smarty-php/smarty/releases/tag/v3.1.45
https://github.com/smarty-php/smarty/commit/64ad6442ca1da31cefdab5c9874262b702cccddd