Prompt Injection Defense 2026: Guardrails & Rebuff Tested
Prompt injection defense is still unsolved in 2026 — see why LLM01 tops OWASP, and how Guardrails and Rebuff actually perform when tested against real attacks.
Chapter 1: Why Prompt Injection Is Still Unsolved in 2026 Here is the uncomfortable truth that this eguide exists to address: prompt injection defense is not a solved problem, it is not close to solved, and anyone selling you a product that claims to have solved it is selling you a filter with a good marketing budget. In 2026, four years after Riley Goodside and Simon Willison independently popularized the attack class, prompt injection still sits at the top of the OWASP Top 10 for LLM Applications as LLM01. It has held that position in every revision. That is not...