A mupdf regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous update.

DLA 2589-2: mupdf regression update

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Debian LTS Advisory DLA-2589-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 14, 2021   https://wiki.debian.org/LTS
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Package : mupdf
Version : 1.9a+ds1-4+deb9u7

DLA 2589-1 incorrectly fixed CVE-2020-26519 and also induced
regression where opening a PDF document resulted in a
SIGFPE crash, a floating point exception.

For Debian 9 stretch, this problem has been fixed in version
1.9a+ds1-4+deb9u7.

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