Use-after-free vulnerability in the ff_h264_free_tables function in libavcodec/h264.c in FFmpeg before 2.3.6 allows remote attackers to cause a denial of service or possibly have unspecified other impact via crafted H.264 data in an MP4 file, as demonstrated by an HTML VIDEO element that references H.264 data.
https://security.gentoo.org/glsa/201705-08
https://github.com/FFmpeg/FFmpeg/commit/e8714f6f93d1a32f4e4655209960afcf4c185214
https://git.libav.org/?p=libav.git%3Ba=blob%3Bf=Changelog%3Bhb=refs/tags/v11.4
http://www.securitytracker.com/id/1032198
http://www.securityfocus.com/bid/74385