Almost Native Graphics Layer Engine (ANGLE), as used in Mozilla Firefox before 7.0 and SeaMonkey before 2.4, does not validate the return value of a GrowAtomTable function call, which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors that trigger a memory-allocation error and a resulting buffer overflow.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14388
https://bugzilla.mozilla.org/show_bug.cgi?id=680840
http://www.mozilla.org/security/announce/2011/mfsa2011-41.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:141