libavcodec/xface.h in FFmpeg before 2.5.2 establishes certain digits and words array dimensions that do not satisfy a required mathematical relationship, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted X-Face image data.
https://security.gentoo.org/glsa/201603-06
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=93a5a16f136d095d23610f57bdad10ba88120fba