Prompt Fuzzer
Open-source interactive prompt resilience testing tool.
What it does
An open-source interactive prompt resilience testing tool from Prompt Security. Generates and tests adversarial inputs against LLM system prompts to evaluate their robustness against injection and manipulation attacks.
Security relevance
Focused specifically on system prompt resilience — testing whether an LLM's instructions can be overridden, extracted, or bypassed. This is the core of LLM01 (Prompt Injection) and one of the most common real-world attack vectors.
When to use it
Use when hardening system prompts before deployment. Run against your production prompts to find injection vectors, then iterate on prompt design. Quick to set up via CLI, but requires understanding of prompt injection techniques to interpret results effectively.
OWASP coverage
Risks addressed — mapped to both OWASP Top 10 standards. 3 in LLM, 1 in Agentic.
The raw record
What Yuntona stores. Single source of truth — fork it on GitHub.
name: Prompt Fuzzer slug: prompt-fuzzer type: Mixed category: AI Red Teaming url: https://github.com/prompt-security/ps-fuzz reviewed: 2026-04 added: 2026-04 updated: 2026-04 risks: llm: [LLM01, LLM02, LLM06] asi: [ASI01] complexity: Guided Setup pricing: — audience: Red Team lifecycle: [test] tags: [CLI, Fuzzing, Open Source]