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Roy Paz Published - March 17, 2026

Poisoned Typeface: How Simple Font Rendering Poisons Every AI Assistant, And Only Microsoft Cares

Executive Summary: LayerX researchers have discovered how a simple custom font can compromise every AI system in the market. With nothing more than a custom font and simple CSS, we created a webpage where the browser renders instructions that would lead the user to execute a reverse shell, while the DOM text analyzed by AI […]

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Poisoned Typeface: How Simple Font Rendering Poisons Every AI Assistant, And Only Microsoft Cares