A pygments security update has been released for Debian GNU/Linux 9 LTS to address a series of denial of service vulnerabilities.

DLA 2600-1: pygments security update

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Debian LTS Advisory DLA-2600-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
March 19, 2021   https://wiki.debian.org/LTS
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Package : pygments
Version : 2.2.0+dfsg-1+deb9u2
CVE ID : CVE-2021-27291

It was discovered that there was a series of denial of service
vulnerabilities in Pygments, a popular syntax highlighting library
for Python.

A number of regular expressions had exponential or cubic worst-case
complexity which could cause a remote denial of service (DoS) when
provided with malicious input.

For Debian 9 "Stretch", this problem has been fixed in version
2.2.0+dfsg-1+deb9u2.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS