A smarty3 security update has been released for Debian GNU/Linux 10 and 11.

DSA 5151-1: smarty3 security update

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Debian Security Advisory DSA-5151-1 security@debian.org
  https://www.debian.org/security/ Markus Koschany
May 29, 2022   https://www.debian.org/security/faq
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Package : smarty3
CVE ID : CVE-2021-21408 CVE-2021-26119 CVE-2021-26120 CVE-2021-29454
CVE-2022-29221
Debian Bug : 1010375 1011758

Several security vulnerabilities have been discovered in smarty3, the compiling
PHP template engine. Template authors are able to run restricted static php
methods or even arbitrary PHP code by crafting a malicious math string or by
choosing an invalid {block} or {include} file name. If a math string was passed
through as user provided data to the math function, remote users were able to
run arbitrary PHP code as well.

For the oldstable distribution (buster), these problems have been fixed
in version 3.1.33+20180830.1.3a78a21f+selfpack1-1+deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 3.1.39-2+deb11u1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/