Free Lossless Audio Codec (FLAC) is "a popular file format for audio data compression. AOL Corp.'s Winamp media player has support for the FLAC format". Remote exploitation of multiple integer overflow vulnerabilities in libFLAC, as included with various vendor's software distributions, allows attackers to execute arbitrary code in the context of the currently logged in user.

http://www.securiteam.com/securitynews/6Q00B1FK0O.html