A lxml regression update has been released for Debian GNU/Linux 10 to address a regression introduced by the previous update.

DSA 4810-2: lxml regression update

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Debian Security Advisory DSA-4810-2 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 19, 2020   https://www.debian.org/security/faq
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Package : lxml

The update for lxml released as 4810-1 introduced a regression when
running under Python 2. Updated lxml packages are now available to
correct this issue.

For the stable distribution (buster), this problem has been fixed in
version 4.3.2-1+deb10u2.

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/