An expat security update has been released for Debian GNU/Linux 10 and 11 to address several vulnerabilities.

DSA 5073-1: expat security update

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Debian Security Advisory DSA-5073-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 12, 2022   https://www.debian.org/security/faq
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Package : expat
CVE ID : CVE-2021-45960 CVE-2021-46143 CVE-2022-22822 CVE-2022-22823
CVE-2022-22824 CVE-2022-22825 CVE-2022-22826 CVE-2022-22827
CVE-2022-23852 CVE-2022-23990
Debian Bug : 1002994 1003474

Several vulnerabilities have been discovered in Expat, an XML parsing C
library, which could result in denial of service or potentially the
execution of arbitrary code, if a malformed XML file is processed.

For the oldstable distribution (buster), these problems have been fixed
in version 2.2.6-2+deb10u2.

For the stable distribution (bullseye), these problems have been fixed in
version 2.2.10-2+deb11u1.

We recommend that you upgrade your expat packages.

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

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/