A xerces-c security update has been released for Debian GNU/Linux 10 to address a use-after-free vulnerability.

DSA 4814-1: xerces-c security update

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Debian Security Advisory DSA-4814-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
December 17, 2020   https://www.debian.org/security/faq
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Package : xerces-c
CVE ID : CVE-2018-1311
Debian Bug : 947431

It was discovered that xerces-c, a validating XML parser library for
C++, did not correctly scan DTDs. The use-after-free vulnerability
resulting from this issue would allow a remote attacker to leverage a
specially crafted XML file in order to crash the application or
potentially execute arbitrary code.
Please note that the patch fixing this issue comes at the expense of a
newly introduced memory leak.

For the stable distribution (buster), this problem has been fixed in
version 3.2.2+debian-1+deb10u1.

We recommend that you upgrade your xerces-c packages.

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

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/