bug-of-the-month club

bug-of-the-month club
 n.

   [from "book-of-the-month club", a time-honored mail-order-marketing
   technique in the U.S.] A mythical club which users of sendmail(8) (the
   Unix mail daemon) belong to; this was coined on the Usenet newsgroup
   comp.security.unix at a time when sendmail security holes, which
   allowed outside {cracker}s access to the system, were being uncovered
   at an alarming rate, forcing sysadmins to update very often. Also,
   more completely, fatal security bug-of-the-month club. See also
   {kernel-of-the-week club}.