A lxml security update has been released for Debian GNU/Linux 10 to address an issue where Python bindings for libxml2 and libxslt could be bypassed.

DSA 4810-1: lxml security update

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Debian Security Advisory DSA-4810-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 13, 2020   https://www.debian.org/security/faq
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Package : lxml
CVE ID : CVE-2020-27783

Yaniv Nizry discovered that the clean module of lxml, Python bindings for
libxml2 and libxslt could be bypassed.

For the stable distribution (buster), this problem has been fixed in
version 4.3.2-1+deb10u1.

We recommend that you upgrade your lxml packages.

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

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/