Multiple off-by-one errors in FreeType2 before 2.3.6 allow context-dependent attackers to execute arbitrary code via (1) a crafted table in a Printer Font Binary (PFB) file or (2) a crafted SHC instruction in a TrueType Font (TTF) file, which triggers a heap-based buffer overflow.
The ft_bitmap_assure_buffer function in src/base/ftbimap.c in FreeType 2.3.3 allows context-dependent attackers to cause a denial of service and possibly execute arbitrary code via unspecified vectors involving bitmap fonts, related to a "memory buffer overwrite bug."
Integer signedness error in truetype/ttgload.c in Freetype 2.3.4 and earlier might allow remote attackers to execute arbitrary code via a crafted TTF image with a negative n_points value, which leads to an integer overflow and heap-based buffer overflow.