Invisible Threats in AI Prompts

The blog explains how attackers can exploit GPT‑4-class systems through a technique called “unicode tag prompt injection,” where they insert Unicode tag characters to hide malicious instructions inside user input. These hidden characters are ignored visually by humans but still processed by the model’s tokenizer, enabling attackers to override the intended prompt behavior. Developers can mitigate this risk by filtering out characters in the Unicode tag range, using pattern-matching tools like YARA, or employing real-time protections for AI applications. 

https://www.robustintelligence.com/blog-posts/understanding-and-mitigating-unicode-tag-prompt-injection

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