A security researcher discovered a vulnerability in the smolagents agent framework that allows malicious payloads to be executed through tool schema definitions. The payload, hidden within an enum value or property title, was passed directly to the GPT-OSS 120B model, leading to unauthorized execution of an export tool. While the framework's design intentionally trusts the MCP server's schema, the researcher confirmed that this vulnerability extends beyond the tool description into machine-readable slots, with GPT-OSS 120B being particularly susceptible compared to Llama-3.3-70B. AI
IMPACT Highlights a critical security flaw in agent frameworks, potentially impacting the safe deployment of LLMs in production environments.
RANK_REASON Security vulnerability discovered in an agent framework, not a core frontier model release.
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