Debian: DSA-4890-1 Urgent: Kramdown Ruby Insufficient Namespace Check

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/source-package/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/