A libxls security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: libxls-1.6.2-5.fc34

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Fedora Update Notification
FEDORA-2021-785cdbddf9
2021-11-24 01:08:33.426092
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Name : libxls
Product : Fedora 34
Version : 1.6.2
Release : 5.fc34
URL :   https://github.com/libxls/libxls
Summary : Read binary Excel files from C/C++
Description :
This is libxls, a C library for reading Excel files in the old binary OLE
format, plus a command-line tool for converting XLS to CSV (named,
appropriately enough, libxls2csv).

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Update Information:

Security fix for CVE-2021-27836
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ChangeLog:

* Tue Nov 16 2021 Elliott Sales de Andrade 1.6.2-5
- Fix release
* Tue Nov 16 2021 Elliott Sales de Andrade 1.6.2-5
- Fix CVE-2021-27836 (#2023409)
* Thu Jul 22 2021 Fedora Release Engineering - 1.6.2-3
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
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References:

[ 1 ] Bug #2023408 - CVE-2021-27836 libxls: a denial of service via a crafted XLS file
  https://bugzilla.redhat.com/show_bug.cgi?id=2023408
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-785cdbddf9' 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