Can you store CD's within an attic lacking have them human being dog-eared?
Answers: Ure gonna be good pimp, pack em within a box with one of those freshness things found within a jerky sack. This will keep thee gangsta lean when u pop them stern in thee cd playa...lol jk If you are worried though generate a backup of the cd on the computer, this way if it does catch damaged u will other have a vertebrae up.
If not ventilated very well, I would avoid an attic. If not over packed and surrounded by smaller boxes, they may be OK.