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Test your applicationsUpgrade Debian:unstable cups to version 2.4.15-1 or higher.
Note: Versions mentioned in the description apply only to the upstream cups package and not the cups package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to version 2.4.15, a client that connects to cupsd but sends slow messages, e.g. only one byte per second, delays cupsd as a whole, such that it becomes unusable by other clients. This issue has been patched in version 2.4.15.