libavcodec/jpeg2000dec.c in FFmpeg before 2.1 does not ensure the use of valid code-block dimension values, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted JPEG2000 data.
https://trac.ffmpeg.org/ticket/2895
https://security.gentoo.org/glsa/201603-06
https://github.com/FFmpeg/FFmpeg/commit/9a271a9368eaabf99e6c2046103acb33957e63b7
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-6819
http://openwall.com/lists/oss-security/2013/12/08/3