The msrle_decode_pal4 function in msrledec.c in Libav before 10.7 and 11.x before 11.4 and FFmpeg before 2.0.7, 2.2.x before 2.2.15, 2.4.x before 2.4.8, 2.5.x before 2.5.6, and 2.6.x before 2.6.2 allows remote attackers to have unspecified impact via a crafted image, related to a pixel pointer, which triggers an out-of-bounds array access.
https://www.ffmpeg.org/security.html
https://security.gentoo.org/glsa/201705-08
https://security.gentoo.org/glsa/201603-06
https://git.libav.org/?p=libav.git%3Ba=blob%3Bf=Changelog%3Bhb=refs/tags/v11.4
http://www.ubuntu.com/usn/USN-2944-1
http://www.securityfocus.com/bid/74433
http://www.debian.org/security/2015/dsa-3288
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=f7e1367f58263593e6cee3c282f7277d7ee9d553