The exif_process_unicode function in ext/exif/exif.c in PHP before
5.4.37, 5.5.x before 5.5.21, and 5.6.x before 5.6.5 allows remote
attackers to execute arbitrary code or cause a denial of service
(uninitialized pointer free and application crash) via crafted EXIF
data in a JPEG image.
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