Google Chrome before 4.1.249.1059 does not prevent pages from loading with the New Tab page's privileges, which has unknown impact and attack vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11866
http://www.securityfocus.com/bid/39603
http://secunia.com/advisories/39544
http://googlechromereleases.blogspot.com/2010/04/stable-update-security-fixes.html