There is an out-of-bounds read in fz_run_t3_glyph in fitz/font.c in Artifex MuPDF 1.14.0, as demonstrated by mutool.
https://lists.debian.org/debian-lts-announce/2020/07/msg00019.html
https://github.com/TeamSeri0us/pocs/tree/master/mupdf
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-10378