A mupdf security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: mupdf-1.18.0-2.fc33

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Fedora Update Notification
FEDORA-2020-972ad7c8a8
2020-10-23 22:01:02.259755
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Name : mupdf
Product : Fedora 33
Version : 1.18.0
Release : 2.fc33
URL :   http://mupdf.com/
Summary : A lightweight PDF viewer and toolkit
Description :
MuPDF is a lightweight PDF viewer and toolkit written in portable C.
The renderer in MuPDF is tailored for high quality anti-aliased
graphics. MuPDF renders text with metrics and spacing accurate to
within fractions of a pixel for the highest fidelity in reproducing
the look of a printed page on screen.
MuPDF has a small footprint. A binary that includes the standard
Roman fonts is only one megabyte. A build with full CJK support
(including an Asian font) is approximately five megabytes.
MuPDF has support for all non-interactive PDF 1.7 features, and the
toolkit provides a simple API for accessing the internal structures of
the PDF document. Example code for navigating interactive links and
bookmarks, encrypting PDF files, extracting fonts, images, and
searchable text, and rendering pages to image files is provided.

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Update Information:

mupdf 1.18.0 and depending packages
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ChangeLog:

* Thu Oct 8 2020 Michael J Gruber - 1.18.0-2
- support PyMuPDF
* Thu Oct 8 2020 Michael J Gruber - 1.18.0-1
- bugfix and feature release
- bz #1886338 #1886339 #1886083
* Sun Oct 4 2020 Michael J Gruber - 1.18.0-0.1.rc1
- properly name the rc prerelease
- update versions of bundled libs
* Sat Oct 3 2020 Michael J Gruber - 1.18.0-rc1
- mupdf 1.18.0-rc1 test
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References:

[ 1 ] Bug #1886338 - CVE-2020-26519 mupdf: heap based buffer over-write when parsing JBIG2 files allows DoS
  https://bugzilla.redhat.com/show_bug.cgi?id=1886338
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-972ad7c8a8' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys