A pngcheck security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: pngcheck-2.4.0-7.fc33

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Fedora Update Notification
FEDORA-2021-674d704f6c
2021-02-09 00:56:15.132383
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Name : pngcheck
Product : Fedora 33
Version : 2.4.0
Release : 7.fc33
URL :   http://www.libpng.org/pub/png/apps/pngcheck.html
Summary : Verifies the integrity of PNG, JNG and MNG files
Description :
pngcheck verifies the integrity of PNG, JNG and MNG files (by checking the
internal 32-bit CRCs [checksums] and decompressing the image data); it can
optionally dump almost all of the chunk-level information in the image in
human-readable form. For example, it can be used to print the basic statistics
about an image (dimensions, bit depth, etc.); to list the color and
transparency info in its palette (assuming it has one); or to extract the
embedded text annotations. This is a command-line program with batch
capabilities.

The current release supports all PNG, MNG and JNG chunks, including the newly
approved sTER stereo-layout chunk. It correctly reports errors in all but two
of the images in Chris Nokleberg's brokensuite-20061204.

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Update Information:

Buffer overflow fixes: 1. Fix buffer overflow on large MNG LOOP chunk
(RHBZ#1908559). 2. Fix a buffer overrun for certain invalid MNG PPLT chunk
contents (RHBZ#1907428).
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ChangeLog:

* Thu Jan 7 2021 Benjamin A. Beasley - 2.4.0-7
- Fix buffer overflow on large MNG LOOP chunk (RHBZ#1908559)
* Thu Jan 7 2021 Benjamin A. Beasley - 2.4.0-6
- Fix a buffer overrun for certain invalid MNG PPLT chunk contents
(RHBZ#1907428).
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References:

[ 1 ] Bug #1907428 - Private bug
  https://bugzilla.redhat.com/show_bug.cgi?id=1907428
[ 2 ] Bug #1908559 - Private bug
  https://bugzilla.redhat.com/show_bug.cgi?id=1908559
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-674d704f6c' 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