Xiph.org libvorbis before 1.0 does not properly check for underpopulated Huffman trees, which allows remote attackers to cause a denial of service (crash) via a crafted OGG file that triggers memory corruption during execution of the _make_decode_tree function.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-2009)