2026-03-30 · 2026-Q1
ChatGPT Hidden DNS Exfiltration Channel
Which agent, run, or tenant is this?
- Fixable
- Vendor patch
- Vendor response
- Patched
- In the wild
- No
- Actor
- Attacker
Target
OpenAI ChatGPT code execution sandbox
Impact
A single prompt could silently exfiltrate user messages, uploaded files, and other sandbox contents over DNS; same path usable to establish a remote shell inside the Linux runtime
Root cause
Sandbox blocked direct network requests but left recursive DNS resolution unrestricted; data encoded into DNS subdomain labels escaped all other network controls
Sources
Catalog
Cite this: AgentProv incident record: ChatGPT Hidden DNS Exfiltration Channel (2026-03-30). https://agentprov.com/incidents/2026-03-30-chatgpt-hidden-dns-exfiltration-channel
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