A python-babel security update has been released for Debian GNU/Linux 9 LTS to address a missing input sanitizing.

DSA 5018-1: python-babel security update

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Debian Security Advisory DSA-5018-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 09, 2021   https://www.debian.org/security/faq
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Package : python-babel
CVE ID : CVE-2021-20095
Debian Bug : 987824

It was discovered that missing input sanitising in Babel, a set of
tools for internationalising Python applications, could result in
the execution of arbitrary code.

For the oldstable distribution (buster), this problem has been fixed
in version 2.6.0+dfsg.1-1+deb10u1.

We recommend that you upgrade your python-babel packages.

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

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/