A djvulibre security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: djvulibre-3.5.27-28.fc34

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Fedora Update Notification
FEDORA-2021-d781fa9f44
2021-05-07 01:01:44.952333
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Name : djvulibre
Product : Fedora 34
Version : 3.5.27
Release : 28.fc34
URL :   http://djvu.sourceforge.net/
Summary : DjVu viewers, encoders, and utilities
Description :
DjVu is a web-centric format and software platform for distributing documents
and images. DjVu can advantageously replace PDF, PS, TIFF, JPEG, and GIF for
distributing scanned documents, digital documents, or high-resolution pictures.
DjVu content downloads faster, displays and renders faster, looks nicer on a
screen, and consume less client resources than competing formats. DjVu images
display instantly and can be smoothly zoomed and panned with no lengthy
re-rendering.

DjVuLibre is a free (GPL'ed) implementation of DjVu, including viewers,
decoders, simple encoders, and utilities. The browser plugin is in its own
separate sub-package.

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Update Information:

This update fixes several issues in djvulibre. These are mostly related to
opening of corrupted files.
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ChangeLog:

* Mon May 3 2021 Marek Kasik - 3.5.27-28
- Avoid unsigned short overflow in GBitmap when allocating row buffer
- Resolves: #1943424
* Mon May 3 2021 Marek Kasik - 3.5.27-27
- Avoid stack overflow in DjVuPort by remembering which file we are opening
- Resolves: #1943411, #1943685
* Mon May 3 2021 Marek Kasik - 3.5.27-26
- Check input pool for NULL
- Resolves: #1943410
* Mon May 3 2021 Marek Kasik - 3.5.27-25
- Avoid integer overflow when allocating bitmap
- Resolves: #1943409
* Mon May 3 2021 Marek Kasik - 3.5.27-24
- Check image size for 0
- Resolves: #1943408
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References:

[ 1 ] Bug #1943685 - CVE-2021-3500 djvulibre: Stack overflow in function DJVU::DjVuDocument::get_djvu_file() via crafted djvu file
  https://bugzilla.redhat.com/show_bug.cgi?id=1943685
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-d781fa9f44' 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