A mupdf security update has been released for Debian GNU/Linux 9 LTS to address two security issues.

DLA 2589-1: mupdf security update

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Debian LTS Advisory DLA-2589-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 12, 2021   https://wiki.debian.org/LTS
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Package : mupdf
Version : 1.9a+ds1-4+deb9u6
CVE ID : CVE-2020-26519 CVE-2021-3407
Debian Bug : 971595 983684

CVE-2020-26519

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.

CVE-2021-3407

A double free of object during linearization was discovered
in MuPDF, a lightweight PDF viewer, which may lead to memory
corruption and other potential consequences.

For Debian 9 stretch, these problems have been fixed in version
1.9a+ds1-4+deb9u6.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS