Buffer overflows are a pretty common way to exploit a computer. And no program is really immune to malware of one kind or another - which is the reason network/computer security companies still exist. I guess with image files getting more complex, they need to be treated like other file types (Microsoft Office docs come to mind) - don't open them if you don't trust them.
Seems like most people wouldn't take a random PNG image and open it in Photoshop - I hope not anyway.
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1 replieshttp://www.frsirt.com/english/advisories/2007/1577
Seems like most people wouldn't take a random PNG image and open it in Photoshop - I hope not anyway.