A cups security update has been released for Debian GNU/Linux 9 LTS to address a privilege escalation issue.

DLA 3029-1: cups security update

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Debian LTS Advisory DLA-3029-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
May 27, 2022   https://wiki.debian.org/LTS
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Package : cups
Version : 2.2.1-8+deb9u8
CVE ID : CVE-2022-26691
Debian Bug : 1011769

Joshua Mason discovered that a logic error in the validation of the
secret key used in the "local" authorisation mode of the CUPS printing
system may result in privilege escalation.

For Debian 9 stretch, this problem has been fixed in version
2.2.1-8+deb9u8.

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