A mupdf security update has been released for Debian GNU/Linux 10 to address a heap-based buffer overflow.

DSA 4794-1: mupdf security update

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Debian Security Advisory DSA-4794-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
November 21, 2020   https://www.debian.org/security/faq
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Package : mupdf
CVE ID : CVE-2020-26519
Debian Bug : 971595

A heap-based buffer overflow flaw was discovered in MuPDF, a lightweight
PDF viewer, which may result in denial of service or the execution of
arbitrary code if malformed documents are opened.

For the stable distribution (buster), this problem has been fixed in
version 1.14.0+ds1-4+deb10u2.

We recommend that you upgrade your mupdf packages.

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

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/