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.
Doubt is a pain too lonely to know that faith is his twin brother. - Kahlil Gibran