The rtp_packetize_xiph_config function in modules/stream_out/rtpfmt.c in VideoLAN VLC media player before 2.1.6 uses a stack-allocation approach with a size determined by arbitrary input data, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted length value.
https://www.videolan.org/security/sa1501.html
https://github.com/videolan/vlc/commit/204291467724867b79735c0ee3aeb0dbc2200f97