Multiple buffer overflows in Xiph.Org libvorbis before 1.2.0 allow context-dependent attackers to cause a denial of service or have other unspecified impact via a crafted OGG file aka trac Changesets 13162 13168 13169 13170 13172 13211 and 13215 as demonstrated by an overflow in oggenc.exe related to the _psy_noiseguards_8 array.