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The Wire · Showcase

CODEX CLOSES THREE SECURITY GAPS WHILE NODE SDK STEADIES SHIPPING

By RepoJournal · Filed · About OpenAI

Codex patched a repository code execution vulnerability in /diff while tightening sandbox network denial handling, and the Node SDK shipped 6.39.1 to fix undici dispatcher mismatches.

Three critical fixes landed in Codex overnight, all closing attack surface. The most urgent: /diff now blocks repository-configured code execution helpers [1], closing a path where untrusted repos could run arbitrary scripts when users ran diagnostics. Separately, Windows sandbox execution now properly terminates when network denial hits [2] instead of lingering until timeout, eliminating a window where sandboxed code could persist after security policy rejection. Configuration vocabulary also standardized across the platform [3], replacing inconsistent "none" with "deny" for Unix socket permissions to match filesystem policy language. On the Node SDK side, openai-node 6.39.1 shipped with improved guidance for undici dispatcher mismatches [4] and fixed binary upload handling [4], addressing friction points for production integrations. The Codex team also reverted a benchmark crate that broke musl builders [5], keeping the build clean. Thread idle lifecycle wiring landed [6], moving idle state management out of goal-runtime-specific code into generic lifecycle hooks for better composition.

Action items

References

  1. [1] fix(tui): prevent repository-configured code execution in /diff (#24954) openai/codex
  2. [2] fix: cancel Windows sandbox on network denial (#19880) openai/codex
  3. [3] fix(config): use deny for Unix socket permissions (#24970) openai/codex
  4. [4] release: 6.39.1 ↗ openai/openai-node
  5. [5] Revert "Add app-server startup benchmark crate" ↗ openai/codex
  6. [6] Wire task completion into thread-idle lifecycle ↗ openai/codex

FAQ

What changed in OpenAI on May 29, 2026?
Codex patched a repository code execution vulnerability in /diff while tightening sandbox network denial handling, and the Node SDK shipped 6.39.1 to fix undici dispatcher mismatches.
What should OpenAI teams do about it?
Update openai-node to 6.39.1 immediately if using undici or binary uploads • Review any local /diff usage with untrusted repositories and re-run diagnostics • Verify Windows sandbox network policy enforcement in staging before next deploy
Which OpenAI repositories shipped on May 29, 2026?
openai/codex, openai/openai-node

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