The pcre_compile function in pcre_compile.c in PCRE before 8.38 mishandles certain [: nesting, which allows remote attackers to cause a denial of service (CPU consumption) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.
https://security.netapp.com/advisory/ntap-20230216-0002/
https://security.gentoo.org/glsa/201607-02
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
https://bto.bluecoat.com/security-advisory/sa128
https://access.redhat.com/errata/RHSA-2016:1132
http://www.securityfocus.com/bid/82990
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.openwall.com/lists/oss-security/2015/11/29/1
http://www-01.ibm.com/support/docview.wss?uid=isg3T1023886
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://rhn.redhat.com/errata/RHSA-2016-1025.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/174931.html