An expat security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities.

DLA 2935-1: expat security update

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Debian LTS Advisory DLA-2935-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
March 07, 2022   https://wiki.debian.org/LTS
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Package : expat
Version : 2.2.0-2+deb9u5
CVE ID : CVE-2022-23852 CVE-2022-25235 CVE-2022-25236 CVE-2022-25313
CVE-2022-25315
Debian Bug : 1005894 1005895

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 Debian 9 stretch, these problems have been fixed in version
2.2.0-2+deb9u5.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS