A security researcher has published a proof-of-concept attack that can crash an iOS or macOS device using nothing more than 15 lines of CSS code embedded in a webpage. Published by Sabri Haddouche, a security researcher at Wire on GitHub, the CSS code exploits a vulnerability in the WebKit rendering engine, Apple Inc.’s open source web browser engine used by Safari, Mail, the App Store and other apps on both macOS and iOS.

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