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# Decision Models Remain Vulnerable to Prompt Injection Attacks
- URL: https://adjacent.media/signals/decision-models-remain-vulnerable-to-prompt-injection-attacks/
- Published: 2026-10-16T10:15:21.000Z
- Updated: 2026-10-16T10:15:21.000Z
- Description: TypeSafe AI’s Jev, despite claims of hallucination-resistance through structured decision logic, remains vulnerable to adversarial prompts that force incorrect outputs.
- Author: Jonathan Greene
- Tags: #signal, theme-ai, model reliability, prompt injection, hallucination

Source: [Theregister](https://www.theregister.com/ai-and-ml/2026/10/15/jev-and-other-decision-models-can-still-be-tricked-with-prompt-injection/5303184?ref=adjacent.media)

TypeSafe AI's Jev, despite claims of hallucination-resistance through structured decision logic, remains vulnerable to adversarial prompts that force incorrect outputs. The flaw exposes a gap between architectural design—constraining outputs to predefined options—and actual robustness against manipulation. Vendors market safety guarantees around decision models as broader than they are. Enterprises adopting "safer" AI for high-stakes decisions may be underestimating attack surface while relying on marketing differentiation over genuine robustness. The distinction matters: preventing false information generation is not the same as preventing malicious input steering.