A pngcheck security update has been released for Debian GNU/Linux 11 to address multiple security issues.

DSA 5300-1: pngcheck security update

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Debian Security Advisory DSA-5300-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 12, 2022   https://www.debian.org/security/faq
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Package : pngcheck
CVE ID : CVE-2020-35511

Multiple security issues were discovered in pngcheck, a tool to verify
the integrity of PNG, JNG and MNG files, which could potentially result
in the execution of arbitrary code.

For the stable distribution (bullseye), this problem has been fixed in
version 3.0.3-1~deb11u1.

We recommend that you upgrade your pngcheck packages.

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

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/