It was found that the forceput operator could be extracted from the DefineResource method in ghostscript before 9.27. A specially crafted PostScript file could use this flaw in order to, for example, have access to the file system outside of the constrains imposed by -dSAFER.
Artifex MuPDF 1.14.0 has a SEGV in the function fz_load_page of the fitz/document.c file, as demonstrated by mutool. This is related to page-number mishandling in cbz/mucbz.c, cbz/muimg.c, and svg/svg-doc.c.
svg-run.c in Artifex MuPDF 1.14.0 has infinite recursion with stack consumption in svg_run_use_symbol, svg_run_element, and svg_run_use, as demonstrated by mutool.
In Artifex Ghostscript through 9.25, the setpattern operator did not properly validate certain types. A specially crafted PostScript document could exploit this to crash Ghostscript or, possibly, execute arbitrary code in the context of the Ghostscript process. This is a type confusion issue because of failure to check whether the Implementation of a pattern dictionary was a structure type.
In Artifex MuPDF 1.14.0, svg/svg-run.c allows remote attackers to cause a denial of service (recursive calls followed by a fitz/xml.c fz_xml_att crash from excessive stack consumption) via a crafted svg file, as demonstrated by mupdf-gl.
In Artifex MuPDF 1.14.0, the svg_run_image function in svg/svg-run.c allows remote attackers to cause a denial of service (href_att NULL pointer dereference and application crash) via a crafted svg file, as demonstrated by mupdf-gl.
It was found that RHSA-2018:2918 did not fully fix CVE-2018-16509. An attacker could possibly exploit another variant of the flaw and bypass the -dSAFER protection to, for example, execute arbitrary shell commands via a specially crafted PostScript document. This only affects ghostscript 9.07 as shipped with Red Hat Enterprise Linux 7.