Version 4.3 of Sony’s SonicStage CP program has a vulnerability (flaw) that can be exploited for malicious intent. The exploit comes in the form of a playlist received from an external party (website, untrusted friend, etc).
So if you’re using a Sony digital music player and this program on your computer don’t open any playlists you didn’t create yourself, until Sony releases a patch to fix it. Details here.