Use-after-free vulnerability in the Web Workers implementation in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, and SeaMonkey before 2.0.12, allows remote attackers to execute arbitrary code via vectors related to a JavaScript Worker and garbage collection.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14200
https://bugzilla.mozilla.org/show_bug.cgi?id=626631
http://www.securityfocus.com/bid/46663
http://www.mozilla.org/security/announce/2011/mfsa2011-06.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:041