A pyxdg security update has been released for Debian GNU/Linux 9 LTS to address a code injection issue.

DLA 2727-1: pyxdg security update

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Debian LTS Advisory DLA-2727-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
August 03, 2021   https://wiki.debian.org/LTS
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Package : pyxdg
Version : 0.25-4+deb9u1
CVE ID : CVE-2019-12761
Debian Bug : #930099

It was discovered that there was a code injection issue in PyXDG,
a library used to locate freedesktop.org configuration/cache/etc.
directories.

For Debian 9 "Stretch", this problem has been fixed in version
0.25-4+deb9u1.

We recommend that you upgrade your pyxdg packages.

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

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