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Check Point Research

Check Point Research discovered a vulnerability in ChatGPT's code execution runtime that allowed data exfiltration via a DNS-based side channel. Because the sandboxed Python environment blocked direct outbound internet access but still permitted DNS resolution, a malicious prompt could encode sensitive conversation data into DNS subdomain queries and transmit it to an attacker-controlled server — silently, without any user-visible warning or confirmation dialog. The same channel could also be used to establish a remote shell inside the execution container. The attack could be delivered via a crafted prompt shared as a 'productivity tip' or embedded directly in a malicious custom GPT. A proof-of-concept demonstrated leaking patient identity and medical assessments from an uploaded lab PDF. OpenAI confirmed the fix was fully deployed on February 20, 2026.

ChatGPT Data Leakage via a Hidden Outbound Channel in the Code Execution Runtime