A c-ares security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: c-ares-1.17.2-1.fc34

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Fedora Update Notification
FEDORA-2021-0a60cbb948
2021-08-18 01:09:52.133543
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Name : c-ares
Product : Fedora 34
Version : 1.17.2
Release : 1.fc34
URL :   http://c-ares.haxx.se/
Summary : A library that performs asynchronous DNS operations
Description :
c-ares is a C library that performs DNS requests and name resolves
asynchronously. c-ares is a fork of the library named 'ares', written
by Greg Hudson at MIT.

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Update Information:

Update to 1.17.2, fixes security issues including CVE-2021-3672.
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ChangeLog:

* Mon Aug 16 2021 Tom Callaway - 1.17.2-1
- update to 1.17.2
- fixes multiple security issues including CVE-2021-3672
* Wed Jul 21 2021 Fedora Release Engineering - 1.17.1-3
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
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References:

[ 1 ] Bug #1988342 - CVE-2021-3672 c-ares: missing input validation of host names may lead to Domain Hijacking
  https://bugzilla.redhat.com/show_bug.cgi?id=1988342
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-0a60cbb948' 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