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

SECURITY: Fedora 34 Update: mingw-openexr-2.5.5-3.fc34

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Fedora Update Notification
FEDORA-2021-25fe4291c9
2021-06-20 01:06:26.567243
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Name : mingw-openexr
Product : Fedora 34
Version : 2.5.5
Release : 3.fc34
URL :   http://www.openexr.com/
Summary : MinGW Windows openexr library
Description :
MinGW Windows openexr library.

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Update Information:

Backport fix for CVE-2021-3589 and a heap buffer overflow.
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ChangeLog:

* Fri Jun 11 2021 Sandro Mani - 2.5.5-3
- Backport patch for CVE-2021-3598
- Backport fix for heap buffer overflow
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References:

[ 1 ] Bug #1970989 - CVE-2021-3598 mingw-OpenEXR: OpenEXR: Heap buffer overflow in Imf_3_1::CharPtrIO::readChars [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1970989
[ 2 ] Bug #1970994 - CVE-2021-3605 mingw-OpenEXR: OpenEXR: Heap buffer overflow in the rleUncompress function [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1970994
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-25fe4291c9' 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