libavcodec/utils.c in FFmpeg before 2.4.2 omits a certain codec ID during enforcement of alignment, which allows remote attackers to cause a denial of service (out-of-bounds access) or possibly have unspecified other impact via crafted JV data.
https://security.gentoo.org/glsa/201603-06
https://lists.debian.org/debian-lts-announce/2019/02/msg00005.html
http://www.ubuntu.com/usn/USN-2534-1
http://www.ffmpeg.org/security.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=105654e376a736d243aef4a1d121abebce912e6b