A graphviz security update has been released for Debian GNU/Linux 10 to address a buffer overflow issue.

DSA 4914-1: graphviz security update

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Debian Security Advisory DSA-4914-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 12, 2021   https://www.debian.org/security/faq
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Package : graphviz
CVE ID : CVE-2020-18032
Debian Bug : 988000

A buffer overflow was discovered in Graphviz, which could potentially
result in the execution of arbitrary code when processing a malformed
file.

For the stable distribution (buster), this problem has been fixed in
version 2.40.1-6+deb10u1.

We recommend that you upgrade your graphviz packages.

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

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/