A smarty3 regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous update.

DLA 2618-3: smarty3 regression update

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Debian LTS Advisory DLA-2618-3 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
October 20, 2021   https://wiki.debian.org/LTS
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Package : smarty3
Version : 3.1.31+20161214.1.c7d42e4+selfpack1-2+deb9u4
CVE ID : CVE-2018-13982
Debian Bug : 989141

The security update of smarty3, the compiling PHP template engine, issued as
DLA 2618-1 introduced a regression in the smarty_security class when secure
directories are evaluated. Updated smarty3 packages are now available to
correct this issue.

For Debian 9 stretch, this problem has been fixed in version
3.1.31+20161214.1.c7d42e4+selfpack1-2+deb9u4.

We recommend that you upgrade your smarty3 packages.

For the detailed security status of smarty3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/smarty3

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS