For Debian 10 buster, this problem has been fixed in version
4.3.2-3+deb10u1.
We recommend that you upgrade your ruby-redcloth packages.
For the detailed security status of ruby-redcloth please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/ruby-redcloth
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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