regexp.c in Artifex Software, Inc. MuJS allows attackers to cause a denial of service (NULL pointer dereference and crash) via vectors related to regular expression compilation.
https://bugs.ghostscript.com/show_bug.cgi?id=697381
http://www.openwall.com/lists/oss-security/2017/01/13/1
http://www.openwall.com/lists/oss-security/2017/01/12/9
http://git.ghostscript.com/?p=mujs.git%3Bh=fd003eceda531e13fbdd1aeb6e9c73156496e569