An apt security update has been released for both Debian GNU/Linux 9 and 10.

DSA 4685-1: apt security update

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Debian Security Advisory DSA-4685-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
May 14, 2020   https://www.debian.org/security/faq
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Package : apt
CVE ID : CVE-2020-3810

Shuaibing Lu discovered that missing input validation in the ar/tar
implementations of APT, the high level package manager, could result in
denial of service when processing specially crafted deb files.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.4.10.

For the stable distribution (buster), this problem has been fixed in
version 1.8.2.1.

We recommend that you upgrade your apt packages.

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