In GIMP 2.8.22, there is a heap-based buffer over-read in load_image in plug-ins/common/file-gbr.c in the gbr import parser, related to mishandling of UTF-8 data.
https://www.debian.org/security/2017/dsa-4077
https://usn.ubuntu.com/3539-1/
https://lists.debian.org/debian-lts-announce/2017/12/msg00023.html
https://bugzilla.gnome.org/show_bug.cgi?id=790784