Use-after-free vulnerability in the imgContainer::InternalAddFrameHelper function in src/imgContainer.cpp in libpr0n in Mozilla Firefox 3.6 before 3.6.2 allows remote attackers to cause a denial of service (heap memory corruption and application crash) or possibly execute arbitrary code via a multipart/x-mixed-replace animation in which the frames have different bits-per-pixel (bpp) values.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8703
http://www.zerodayinitiative.com/advisories/ZDI-10-047
http://www.vupen.com/english/advisories/2010/0692
http://www.securityfocus.com/bid/38921
http://www.securityfocus.com/bid/38918
http://www.securityfocus.com/archive/1/510535/100/0/threaded
http://www.mozilla.org/security/announce/2010/mfsa2010-09.html
http://www.mandriva.com/security/advisories?name=MDVSA-2010:070