libAACdec/src/aacdec_drc.cpp in mediaserver in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-05-01 does not properly limit the number of threads, which allows remote attackers to execute arbitrary code or cause a denial of service (stack memory corruption) via a crafted media file, aka internal bug 26751339.