The regex implementation in Google V8, as used in Google Chrome before 19.0.1084.46, allows remote attackers to cause a denial of service (invalid write operation) or possibly have unspecified other impact via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15610
https://exchange.xforce.ibmcloud.com/vulnerabilities/75597
http://www.securitytracker.com/id?1027067
http://www.securityfocus.com/bid/53540
http://security.gentoo.org/glsa/glsa-201205-03.xml
http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00017.html
http://googlechromereleases.blogspot.com/2012/05/stable-channel-update.html