Multiple integer overflows in glyphs-eimage.c in XEmacs 21.4.22 when running on Windows allow remote attackers to cause a denial of service (crash) or execute arbitrary code via (1) the tiff_instantiate function processing a crafted TIFF file (2) the png_instantiate function processing a crafted PNG file and (3) the jpeg_instantiate function processing a crafted JPEG file all which trigger a heap-based buffer overflow. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.