Integer overflow in the mark_curve function in Artifex Ghostscript 9.21 allows remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have unspecified other impact via a crafted PostScript document.
https://security.gentoo.org/glsa/201811-12
http://git.ghostscript.com/?p=ghostpdl.git%3Bh=8210a2864372723b49c526e2b102fdc00c9c4699