A lxml security update has been released for Debian GNU/Linux 10 and 11 to address a cross-site scripting issue.

DSA 5043-1: lxml security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-5043-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 12, 2022   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : lxml
CVE ID : CVE-2021-43818
Debian Bug : 1001885

It was discovered that lxml, a Python binding for the libxml2 and
libxslt libraries, does not properly sanitize its input, which could
lead to cross-site scripting.

For the oldstable distribution (buster), this problem has been fixed
in version 4.3.2-1+deb10u4.

For the stable distribution (bullseye), this problem has been fixed in
version 4.6.3+dfsg-0.1+deb11u1.

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/