A mingw-openexr security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: mingw-openexr-2.5.5-2.fc34

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Fedora Update Notification
FEDORA-2021-c194de7719
2021-05-10 01:04:26.835246
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Name : mingw-openexr
Product : Fedora 34
Version : 2.5.5
Release : 2.fc34
URL :   http://www.openexr.com/
Summary : MinGW Windows openexr library
Description :
MinGW Windows openexr library.

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Update Information:

Backport patch for CVE-2021-23169.
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ChangeLog:

* Sat May 1 2021 Sandro Mani - 2.5.5-2
- Backport patch for CVE-2021-23169
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References:

[ 1 ] Bug #1952477 - CVE-2021-23169 mingw-OpenEXR: OpenEXR: Heap-buffer-overflow in Imf_2_5::copyIntoFrameBuffer [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1952477
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-c194de7719' 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