A matrix-synapse security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: matrix-synapse-1.23.0-1.fc33

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Fedora Update Notification
FEDORA-2020-2578d943d2
2020-12-10 01:13:07.368706
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Name : matrix-synapse
Product : Fedora 33
Version : 1.23.0
Release : 1.fc33
URL :   https://github.com/matrix-org/synapse
Summary : A Matrix reference homeserver written in Python using Twisted
Description :
Matrix is an ambitious new ecosystem for open federated Instant Messaging and
VoIP. Synapse is a reference "homeserver" implementation of Matrix from the
core development team at matrix.org, written in Python/Twisted. It is intended
to showcase the concept of Matrix and let folks see the spec in the context of
a coded base and let you run your own homeserver and generally help bootstrap
the ecosystem.

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Update Information:

Update matrix-synapse to 1.23.0 to resolve CVE-2020-26890. There may be
breaking changes, please review prior to upgrade:   https://github.com/matrix-
org/synapse/blob/develop/UPGRADE.rst
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ChangeLog:

* Mon Nov 30 2020 Gwyn Ciesla - 1.23.0-1
- 1.23.0
* Sat Aug 29 2020 Kai A. Hiller - 1.18.0-1
- Update to v1.18.0
* Sat Aug 1 2020 Fedora Release Engineering - 1.13.0-4
- Second attempt - Rebuilt for
  https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Tue Jul 28 2020 Fedora Release Engineering - 1.13.0-3
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
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References:

[ 1 ] Bug #1796270 - python-signedjson-1.1.1 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1796270
[ 2 ] Bug #1840452 - matrix-synapse-1.23.0 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1840452
[ 3 ] Bug #1861208 - python-canonicaljson-1.4.0 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1861208
[ 4 ] Bug #1864122 - matrix-synapse: FTBFS in Fedora rawhide/f33
  https://bugzilla.redhat.com/show_bug.cgi?id=1864122
[ 5 ] Bug #1901509 - CVE-2020-26890 matrix-synapse: DoS attack due to invalid JSON [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1901509
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-2578d943d2' 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