MFSA2015-89 SeaMonkey: Buffer overflows on Libvpx when decoding WebM video (CVE-2015-4486)
The decrease_ref_count function in libvpx in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via malformed WebM video data.
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