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.
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