Google V8, as used in Google Chrome before 14.0.835.163, does not properly perform object sealing, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that leverage "type confusion."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14229
https://exchange.xforce.ibmcloud.com/vulnerabilities/69893
http://googlechromereleases.blogspot.com/2011/09/stable-channel-update_16.html