A pygments security update has been released for Debian GNU/Linux 10 to address a denial of service issue.

DSA 4878-1: pygments security update

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Debian Security Advisory DSA-4878-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 27, 2021   https://www.debian.org/security/faq
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Package : pygments
CVE ID : CVE-2021-27291
Debian Bug : 985574

Ben Caller discovered that Pygments, a syntax highlighting package
written in Python 3, used regular expressions which could result in
denial of service.

For the stable distribution (buster), this problem has been fixed in
version 2.3.1+dfsg-1+deb10u2.

We recommend that you upgrade your pygments packages.

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

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/