It was discovered that missing input sanitising in cups-filters, when using the Backend Error Handler (beh) backend to create an accessible network printer, may result in the execution of arbitrary commands.
For the stable distribution (bullseye), this problem has been fixed in version 1.28.7-1+deb11u2.
We recommend that you upgrade your cups-filters packages.
For the detailed security status of cups-filters please refer to its security tracker page at: \ https://security-tracker.debian.org/tracker/cups-filters