A: python-apt regression update has been released for Debian GNU/Linux 10 to address a regression introduced by the previous update.

DSA 4809-2: python-apt regression update

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Debian Security Advisory DSA-4809-2 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 27, 2020   https://www.debian.org/security/faq
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Package : python-apt
Debian Bug : 977000

The update for python-apt released as DSA 4809-1 introduced a regression
when passing a file descriptor to apt_inst.ArFile or apt_inst.DebFile
causing a segmentation fault. Updated python-apt packages are now
available to correct this issue.

For the stable distribution (buster), this problem has been fixed in
version 1.8.4.3.

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/