Artifex Ghostscript 9.25 and earlier allows attackers to bypass a sandbox protection mechanism via vectors involving the 1Policy operator.
https://www.debian.org/security/2018/dsa-4336
https://usn.ubuntu.com/3803-1/
https://security.gentoo.org/glsa/201811-12
https://lists.debian.org/debian-lts-announce/2018/10/msg00013.html
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101
https://bugs.ghostscript.com/show_bug.cgi?id=699963
https://bugs.chromium.org/p/project-zero/issues/detail?id=1696