Microsoft, Adobe, Oracle, Apple security bulletin advisories
If all else fails, which would be a pretty traumatic event for the aforementioned government agencies and security vendors, you of course can get pertinent software threat updates from the vendors themselves. All are a bit difficult to navigate, at least in comparison to some of the real-time updated sites, but essentially get the job done. For those who would rather have that news come to them, Microsoft, Adobe and Oracle all offer email notification systems. But for Apple users, it looks like you’re on your own.