While we do everything we can to make CUPS bug-free, it may not always work as expected. When this happen we want you to file a report of the issue, including information such as the operating system or Linux distribution you are using, the printers and/or applications that are affected, and configuration and/or log files to help us reproduce the issue and come up with a fix.
Security bugs should be sent to firstname.lastname@example.org, which is the dedicated address for security reports at Apple. Apple will then coordinate with the various vendors that distribute CUPS so that everyone has a fix and the disclosure of the issue is done responsibly.
Bugs in macOS software (System Preferences, Print dialog, Printer window, or the version of CUPS included with macOS) should be reported to Apple at https://bugreport.apple.com.
Bugs in Linux software or printer drivers should be reported to the Linux distributor, the cups-filters project, or the printer driver developer.
Any bugs in the CUPS software itself that do not involve a security vulnerability should be reported to the CUPS Github Issue Tracker. Pull requests are also welcome!
Note: Please report all security bugs to email@example.com and not using the Github issue tracker. Github does not offer “private” issues so any issues reported on Github are instantly visible to everyone.