According to Cisco's Talos security team, iOS and Mac OS X devices are possibly at risk. In its post, Talos described 5 particular vulnerabilities that would allow someone to insert malicious code that would activate when OS X processes certain image file formats: TIFF, OpenEXR, Digital Asset Exchange and BMP. The security team found the exploit to be a big threat as it could be triggered by many applications like iMessages that automatically render that file format when received or present multiple images in tiled arrangement. If you’re updated to the lasted version of OS X El Capitan and iOS (which were released on July 18th) then you’ll be fine.
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