Buffer overflow in the JavaScript engine in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, and SeaMonkey before 2.0.12, might allow remote attackers to execute arbitrary code via vectors involving exception timing and a large number of string values, aka an "atom map" issue.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14013
https://bugzilla.mozilla.org/show_bug.cgi?id=622015
http://www.securityfocus.com/bid/46650
http://www.mozilla.org/security/announce/2011/mfsa2011-05.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:041