Integer overflow in a certain quantvals and quantlist calculation in Xiph.org libvorbis 1.2.0 and earlier allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted OGG file with a large virtual space for its codebook, which triggers a heap overflow.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1423)