--- title: ChatGPT Data Leakage via a Hidden Outbound Channel in... description: Check Point Research discovered a vulnerability in ChatGPT's code execution runtime that allowed data exfiltration via a DNS-based side channel. Because the... canonical: https://daily.dev/posts/chatgpt-data-leakage-via-a-hidden-outbound-channel-in-the-code-execution-runtime-4zridv9yw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: ChatGPT Data Leakage via a Hidden Outbound Channel in the Code Execution Runtime | daily.dev og:description: Check Point Research discovered a vulnerability in ChatGPT's code execution runtime that allowed data exfiltration via a DNS-based side channel. Because the... og:url: https://daily.dev/posts/chatgpt-data-leakage-via-a-hidden-outbound-channel-in-the-code-execution-runtime-4zridv9yw og:image: https://api.daily.dev/og/posts/4ZriDv9Yw.png og:image:alt: ChatGPT Data Leakage via a Hidden Outbound Channel in the Code Execution Runtime og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # ChatGPT Data Leakage via a Hidden Outbound Channel in the Code Execution Runtime **[Check Point Research](https://daily.dev/sources/cpresearch)** · 10 min read · 0 upvotes · 0 comments ## Summary 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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [OpenAI ChatGPT fixes DNS data smuggling flaw](https://daily.dev/posts/openai-chatgpt-fixes-dns-data-smuggling-flaw-33yjya6he) · The Register · 1 upvotes · 1 comments - [HackedGPT: Novel AI Vulnerabilities Open the Door for Private Data Leakage](https://daily.dev/posts/hackedgpt-novel-ai-vulnerabilities-open-the-door-for-private-data-leakage-v1llnf112) · Security Boulevard · 0 upvotes · 0 comments --- Tags: [#chatgpt](https://daily.dev/tags/chatgpt), [#ai-security](https://daily.dev/tags/ai-security), [#prompt-injection](https://daily.dev/tags/prompt-injection), [#data-exfiltration](https://daily.dev/tags/data-exfiltration) [View this post on daily.dev](https://daily.dev/posts/chatgpt-data-leakage-via-a-hidden-outbound-channel-in-the-code-execution-runtime-4zridv9yw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"ChatGPT Data Leakage via a Hidden Outbound Channel in the Code Execution Runtime","url":"https://daily.dev/posts/chatgpt-data-leakage-via-a-hidden-outbound-channel-in-the-code-execution-runtime-4zridv9yw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/chatgpt-data-leakage-via-a-hidden-outbound-channel-in-the-code-execution-runtime-4zridv9yw"},"datePublished":"2026-03-30T13:17:58.565Z","dateModified":"2026-03-30T13:18:36.438Z","description":"Check Point Research discovered a vulnerability in ChatGPT's code execution runtime that allowed data exfiltration via a DNS-based side channel. 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