Building a safe, effective sandbox to enable Codex on Windows
infonewsLLM-Specific
securitysafety
Source: OpenAI BlogMay 13, 2026
Summary
Codex, OpenAI's coding agent, previously lacked a sandbox (a constrained execution environment with restricted permissions) on Windows, forcing users to either approve every command or allow unrestricted access. To solve this, the Codex team built a custom sandbox implementation because existing Windows tools like AppContainer, Windows Sandbox, and Mandatory Integrity Control labeling were either too restrictive for open-ended developer workflows or incompatible with the product requirements.
Classification
Attack SophisticationModerate
Impact (CIA+S)
safetyintegrity
AI Component TargetedAgent
Affected Vendors
OpenAI
Related Issues
Monthly digest — independent AI security research
Original source: https://openai.com/index/building-codex-windows-sandbox
First tracked: May 13, 2026 at 08:00 PM
Classified by LLM (prompt v3) · confidence: 85%