The exifprocessIFDinJPEG function in ext/exif/exif.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 does not validate IFD sizes, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via crafted header data.
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"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-4543.json"