A freetype security update has been released for Debian GNU/Linux 10 to address a heap-based buffer overflow vulnerability in the handling of embedded PNG bitmaps in FreeType.

DSA 4777-1: freetype security update

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Debian Security Advisory DSA-4777-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
October 21, 2020   https://www.debian.org/security/faq
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Package : freetype
CVE ID : CVE-2020-15999
Debian Bug : 972586

Sergei Glazunov discovered a heap-based buffer overflow vulnerability in
the handling of embedded PNG bitmaps in FreeType. Opening malformed
fonts may result in denial of service or the execution of arbitrary
code.

For the stable distribution (buster), this problem has been fixed in
version 2.9.1-3+deb10u2.

We recommend that you upgrade your freetype packages.

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

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/