A vulnerability was found in deepseek-ai deepseek-harness up to 0.1.0-rc.7. Impacted is the function run_code of the component Code Mode Sandbox. The manipulation results in sandbox issue. The attack can be executed remotely. The vendors own code, SAFETY.md, and design notes all explicitly state the worker is containment, not a security boundary. The vendor was contacted early about this disclosure but did not respond in any way.