Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:9 relevant versions.
The add_job function in scheduler/ipp.c in CUPS before 2.2.6, when D-Bus support is enabled, can be crashed by remote attackers by sending print jobs with an invalid username, related to a D-Bus notification.
cups to version 2.2.1-8+deb9u3 or higher.