A ruby-kramdown security update has been released for Debian GNU/Linux 10 to address an issue with insufficient namespace validation of Rouge syntax highlighting formatters.

DSA 4890-1: ruby-kramdown security update

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Debian Security Advisory DSA-4890-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 12, 2021   https://www.debian.org/security/faq
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Package : ruby-kramdown
CVE ID : CVE-2021-28834
Debian Bug : 985569

Stan Hu discovered that kramdown, a pure Ruby Markdown parser and
converter, performed insufficient namespace validation of Rouge syntax
highlighting formatters.

For the stable distribution (buster), this problem has been fixed in
version 1.17.0-1+deb10u2.

We recommend that you upgrade your ruby-kramdown packages.

For the detailed security status of ruby-kramdown please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/ruby-kramdown

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/