--- title: OpenCode Security Breach: Distillation Attack Hit... description: OpenCode, the open source AI coding agent, disclosed a security breach on October 18, 2026 involving a large-scale distillation attack affecting 1.4% of... canonical: https://daily.dev/posts/opencode-security-breach-distillation-attack-hit-console-users-with-linked-ai-providers-how-to-fin-yuh4w55nj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: OpenCode Security Breach: Distillation Attack Hit Console Users With Linked AI Providers. How to Find OpenCode on Developer Machines and Respond | daily.dev og:description: OpenCode, the open source AI coding agent, disclosed a security breach on October 18, 2026 involving a large-scale distillation attack affecting 1.4% of... og:url: https://daily.dev/posts/opencode-security-breach-distillation-attack-hit-console-users-with-linked-ai-providers-how-to-fin-yuh4w55nj og:image: https://api.daily.dev/og/posts/YuH4W55nJ.png og:image:alt: OpenCode Security Breach: Distillation Attack Hit Console Users With Linked AI Providers. How to Find OpenCode on Developer Machines and Respond 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. # OpenCode Security Breach: Distillation Attack Hit Console Users With Linked AI Providers. How to Find OpenCode on Developer Machines and Respond **[StepSecurity](https://daily.dev/sources/stepsecurity)** · 4 min read · 0 upvotes · 0 comments ## Summary OpenCode, the open source AI coding agent, disclosed a security breach on October 18, 2026 involving a large-scale distillation attack affecting 1.4% of OpenCode Console users with linked AI provider accounts (Anthropic, OpenAI, Google). Affected users were notified by email; details on root cause and data exposure remain undisclosed. The post explains why linked provider credentials matter (potential unauthorized inference and spend), how to find OpenCode installations across developer machines using StepSecurity's Dev Machine Guard (or its open source scanner), and recommends three steps for affected developers: check for the notification email, inspect the local auth.json file for linked providers, and rotate any exposed API keys. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What happened in the OpenCode security breach announced on October 18, 2026? OpenCode disclosed a large-scale distillation attack that impacted 1.4 percent of OpenCode Console users who had linked external AI providers. The company notified all affected users by email the morning after the incident and said it is working with Anthropic, OpenAI, and Google to remediate. Root cause and details on what data was accessed have not been published, and the incident was described as ongoing. _Track emerging details on AI coding tool incidents like this one as they develop on daily.dev._ ### How do I check which AI provider credentials are linked to OpenCode on my machine? OpenCode stores linked provider credentials in a local auth file at ~/.local/share/opencode/auth.json on macOS and Linux, or %USERPROFILE%\.local\share\opencode\auth.json on Windows. Running cat on that file reveals every provider connected to the account, such as Anthropic, OpenAI, or Google, and each one listed should be treated as a credential worth rotating after a breach disclosure. _Developers auditing AI coding agent credentials can keep tabs on security guidance via daily.dev._ ### How can I find out which developers on my team have OpenCode installed? Open source tooling like StepSecurity's Dev Machine Guard can scan developer machines for the OpenCode CLI binary, its config directory, and MCP server configuration across macOS, Windows, and Linux. It can run as a one-time scan on a single machine via a downloadable release, or fleet-wide through an MDM-deployed installation script paired with a coding tools inventory page, though it does not reveal which AI providers a developer has linked. _Teams building an inventory of AI coding agents across their fleet can follow related tooling news on daily.dev._ ## Similar posts on daily.dev - [Attack targeting OpenAI Codex users exposes AI software supply chain risks](https://daily.dev/posts/attack-targeting-openai-codex-users-exposes-ai-software-supply-chain-risks-x1yygxvy1) · CSO Online · 0 upvotes · 0 comments - [Why 157,000 developers are hedging against Anthropic with OpenCode](https://daily.dev/posts/why-157-000-developers-are-hedging-against-anthropic-with-opencode-myktaoppc) · The New Stack · 8 upvotes · 1 comments --- Tags: [#security](https://daily.dev/tags/security), [#ai-agents](https://daily.dev/tags/ai-agents), [#opencode](https://daily.dev/tags/opencode) [View this post on daily.dev](https://daily.dev/posts/opencode-security-breach-distillation-attack-hit-console-users-with-linked-ai-providers-how-to-fin-yuh4w55nj) ```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":"OpenCode Security Breach: Distillation Attack Hit Console Users With Linked AI Providers. 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