Uploaded January 2026 | Updated September 2026, 2 hours ago

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Day 36/42: Prompt Injection

Yesterday, we talked guardrails.
Today, we break them.

Prompt injection is when hidden text tries to override instructions.

This often happens in:
retrieved documents,
web pages,
tool outputs.

It’s phishing for machines.

The fix isn’t better prompts.
It’s isolation, filtering, and strict system boundaries.

Missed Day 35? Critical one.
Tomorrow, we look at a gentler control method: preference tuning.

I’m Louis-François, PhD dropout, now CTO & co-founder at Towards AI. Follow me for tomorrow’s no-BS AI roundup 🚀

#PromptInjection #LLM #AIExplained #short