A lxml security update has been released for Debian GNU/Linux 10 to address a cross-site scripting attack issue.

DSA 4880-1: lxml security update

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Debian Security Advisory DSA-4880-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
March 29, 2021   https://www.debian.org/security/faq
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Package : lxml
CVE ID : CVE-2021-28957
Debian Bug : 985643

Kevin Chung discovered that lxml, a Python binding for the libxml2 and
libxslt libraries, did not properly sanitize its input. This would
allow a malicious user to mount a cross-site scripting attack.

For the stable distribution (buster), this problem has been fixed in
version 4.3.2-1+deb10u3.

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/