A mailman security update has been released for Fedora 31.

SECURITY: Fedora 31 Update: mailman-2.1.34-1.fc31

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Fedora Update Notification
FEDORA-2020-62f2df3ca4
2020-07-22 01:19:44.413051
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Name : mailman
Product : Fedora 31
Version : 2.1.34
Release : 1.fc31
URL :   http://www.list.org/
Summary : Mailing list manager with built in Web access
Description :
Mailman is software to help manage email discussion lists, much like
Majordomo and Smartmail. Unlike most similar products, Mailman gives
each mailing list a webpage, and allows users to subscribe,
unsubscribe, etc. over the Web. Even the list manager can administer
his or her list entirely from the Web. Mailman also integrates most
things people want to do with mailing lists, including archiving, mail
news gateways, and so on.

Documentation can be found in: /usr/share/doc/mailman

When the package has finished installing, you will need to perform some
additional installation steps, these are described in:
/usr/share/doc/mailman/INSTALL.REDHAT

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Update Information:

notes=Security fix for CVE-2020-12108
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ChangeLog:

* Fri Jul 3 2020 Pavel Zhukov - 3:2.1.34-1
- new version v2.1.34
* Mon May 11 2020 Pavel Zhukov - 3:2.1.33-1
- new version v2.1.33
* Wed May 6 2020 Pavel Zhukov - 3:2.1.32-2
- Change mode of /etc/mailman to 2755 (#1656765)
* Wed May 6 2020 Pavel Zhukov - 3:2.1.32-1
- New version v2.1.32
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References:

[ 1 ] Bug #1848856 - CVE-2020-12108 mailman: /options/mailman allows Arbitrary Content Injection
  https://bugzilla.redhat.com/show_bug.cgi?id=1848856
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-62f2df3ca4' 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