A libX11 security update has been released for Fedora 31.

SECURITY: Fedora 31 Update: libX11-1.6.12-1.fc31

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Fedora Update Notification
FEDORA-2020-9a0b272cc1
2020-09-10 17:33:51.795802
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Name : libX11
Product : Fedora 31
Version : 1.6.12
Release : 1.fc31
URL :   http://www.x.org
Summary : Core X11 protocol client library
Description :
Core X11 protocol client library.

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Update Information:

libX11 1.6.12 (CVE-2020-14363, CVE 2020-14344)
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ChangeLog:

* Wed Aug 26 2020 Peter Hutterer 1.6.12-1
- libX11 1.6.12 (CVE-2020-14363, CVE 2020-14344)
* Fri Jul 31 2020 Adam Jackson - 1.6.9-5
- Fix server reply validation issue in XIM (CVE 2020-14344)
* Tue Jul 28 2020 Fedora Release Engineering - 1.6.9-4
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Wed Jan 29 2020 Fedora Release Engineering - 1.6.9-3
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
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References:

[ 1 ] Bug #1862255 - CVE-2020-14344 libX11: Heap overflow in the X input method client
  https://bugzilla.redhat.com/show_bug.cgi?id=1862255
[ 2 ] Bug #1872473 - CVE-2020-14363 libX11: integer overflow leads to double free in locale handling
  https://bugzilla.redhat.com/show_bug.cgi?id=1872473
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-9a0b272cc1' 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