I mentioned this in a reply above....
Is there reason that you were subscribed to their announce mailing list? If so, you would have know about this issue months ago. Plenty of time to upgrade/test/deploy even in the most restrictive environments.
See http://lists.clamav.net/mailman/listinfo/clamav-announce for the archives and subscribing information.
Any reason that you did not do what the organization requested?
From http://www.clamav.net/lang/en/download/sources/ it states:
Please subscribe to our freshmeat project page or clamav-announce to receive notifications of new stable releases and RCs.
They sent out a couple of notices about what was going to happen.
I will give the poster a little leeway in that this notice is only on the source download page and not the parent download page or the other distribution download pages.
This is the theory that Jack built. This is the flaw that lay in the theory that Jack built. This is the palpable verbal haze that hid the flaw that lay in...