A python-apt security update security update has been released for Debian GNU/Linux 9 LTS to address various memory and file descriptor leaks.

DLA 2488-1: python-apt security update

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Debian LTS Advisory DLA-2488-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 10, 2020   https://wiki.debian.org/LTS
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Package : python-apt
Version : 1.4.2
CVE ID : CVE-2020-27351

Various memory and file descriptor leaks were discovered in the Python
interface to the APT package management runtime library, which could
result in denial of service.

For Debian 9 stretch, this problem has been fixed in version
1.4.2.

We recommend that you upgrade your python-apt packages.

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

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