A cups security update has been released for Debian GNU/Linux 9 LTS to address an input validation issue.

DLA 2800-1: cups security update

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Debian LTS Advisory DLA-2800-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
October 30, 2021   https://wiki.debian.org/LTS
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Package : cups
Version : 2.2.1-8+deb9u7
CVE ID : CVE-2020-10001

An issue has been found in cups, the Common UNIX Printing System.
Due to an input validation issue a malicious application might be allowed
to read restricted memory.

For Debian 9 stretch, this problem has been fixed in version
2.2.1-8+deb9u7.

We recommend that you upgrade your cups packages.

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

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