An issue was discovered in MP4Box in GPAC 0.7.1. There is a heap-based buffer over-read in the isomedia/box_dump.c function hdlr_dump.
https://usn.ubuntu.com/3926-1/
https://lists.debian.org/debian-lts-announce/2018/07/msg00024.html
https://github.com/gpac/gpac/commit/bceb03fd2be95097a7b409ea59914f332fb6bc86