Stack-based buffer overflow in the aac_sync function in aac_parser.c in Libav before 11.5 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted file.
https://git.libav.org/?p=libav.git%3Ba=commit%3Bh=fb1473080223a634b8ac2cca48a632d037a0a69d
https://blogs.gentoo.org/ago/2016/08/20/libav-stack-based-buffer-overflow-in-aac_sync-aac_parser-c/