A rubygem-json security update has been released for Fedora 30.

SECURITY: Fedora 30 Update: rubygem-json-2.2.0-202.fc30

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Fedora Update Notification
FEDORA-2020-d171bf636d
2020-05-03 04:40:20.140215
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Name : rubygem-json
Product : Fedora 30
Version : 2.2.0
Release : 202.fc30
URL :   http://json.rubyforge.org
Summary : A JSON implementation in Ruby
Description :
This is a implementation of the JSON specification according
to RFC 4627 in Ruby.
You can think of it as a low fat alternative to XML,
if you want to store data to disk or transmit it over
a network rather than use a verbose markup language.

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Update Information:

A security flaw was found on rubygem-json prior to 2.3.0 which was now assigned
as CVE-2020-10663. This new rpm contains backport fixes for this issue.
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ChangeLog:

* Sat Apr 25 2020 Mamoru TASAKA - 2.2.0-202
- Backport fix for CVE-2020-10663 from 2.3.0 (bug 1827500)
* Fri Jul 26 2019 Fedora Release Engineering - 2.2.0-201
- Rebuilt for   https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
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References:

[ 1 ] Bug #1827501 - CVE-2020-10663 rubygem-json: Unsafe Object Creation Vulnerability in JSON [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1827501
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-d171bf636d' 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