A python-apt security update has been released for both Debian GNU/Linux 9 and 10 to address two security issues.

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Debian Security Advisory DSA-4609-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 23, 2020   https://www.debian.org/security/faq
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Package : python-apt
CVE ID : CVE-2019-15795 CVE-2019-15796
Debian Bug : 944696

Two security issues were found in the Python interface to the apt
package manager; package downloads from unsigned repositories were
incorrectly rejected and the hash validation relied on MD5.

For the oldstable distribution (stretch), these problems have been fixed
in version 1.4.1.

For the stable distribution (buster), these problems have been fixed in
version 1.8.4.1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/