There is an out-of-bounds read in fzrunt3_glyph in fitz/font.c in Artifex MuPDF 1.14.0, as demonstrated by mutool.
{ "binaries": [ { "binary_version": "1.12.0+ds1-1ubuntu0.1~esm1", "binary_name": "libmupdf-dev" }, { "binary_version": "1.12.0+ds1-1ubuntu0.1~esm1", "binary_name": "mupdf" }, { "binary_version": "1.12.0+ds1-1ubuntu0.1~esm1", "binary_name": "mupdf-tools" } ] }