ghostscript is vulnerable to denial of service (DOS) attacks. Remote attackers could execute arbitrary code via a crafted Postscript document that calls .sethalftone5 with an empty operand stack causing an application crash.
git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=f5c7555c303
rhn.redhat.com/errata/RHSA-2017-0013.html
rhn.redhat.com/errata/RHSA-2017-0014.html
www.debian.org/security/2016/dsa-3691
www.openwall.com/lists/oss-security/2016/10/11/5
www.openwall.com/lists/oss-security/2016/10/11/7
www.securityfocus.com/bid/95311
access.redhat.com/errata/RHSA-2017:0014
access.redhat.com/security/updates/classification/#moderate
bugs.ghostscript.com/show_bug.cgi?id=697203
bugzilla.redhat.com/show_bug.cgi?id=1383940
ghostscript.com/doc/9.21/History9.htm
security.gentoo.org/glsa/201702-31