Package: command-not-found Severity: important c-n-f uses an ancient c_n_f_handle as c_n_f_handler.
Since this leads, depending on the sets of installed, purged and removed but not purged packages, to a silently failing wipe command, you might want to add a security tag to this bug. Launchpad contains all relevant details for this bug and answers to all related questions I can imagine, hence please see there for further details in case you need them. Recent Ubuntu c-n-f packages contain fixed versions of c_n_f_handle and c_n_f_handler, please merge and adapt these. You might need to add an option to your program that is equivalent to the one used in Ubuntu's c_n_f_handle. Not ignoring me on IRC would have saved me from dgetting this cra^Wpackage you uploaded yesterday and from writing this mail.