Google V8, as used in Google Chrome before 19.0.1084.52, does not properly perform garbage collection, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via crafted JavaScript code.
http://code.google.com/p/chromium/issues/detail?id=117409
http://googlechromereleases.blogspot.com/2012/05/stable-channel-update_23.html
http://secunia.com/advisories/49277
http://secunia.com/advisories/49306
http://security.gentoo.org/glsa/glsa-201205-04.xml
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15095