The pcre_exec function in pcre_exec.c in PCRE before 8.38 mishandles a // pattern with a \01 string, which allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.
lists.fedoraproject.org/pipermail/package-announce/2015-December/173700.html
vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup
www.openwall.com/lists/oss-security/2015/11/29/1
www.securityfocus.com/bid/77695
blog.fuzzing-project.org/29-Heap-Overflow-in-PCRE.html
bto.bluecoat.com/security-advisory/sa128
bugs.exim.org/show_bug.cgi?id=1637
security.gentoo.org/glsa/201607-02