GitHub Advisoryadvisory · npm

GHSA-w5fx-fh39-j5rw Codex has sandbox bypass due to bug in path configuration logic

HIGH Published 2025-09-19 Modified 2025-09-22 Official page ↗
Aliases
CVE-2025-59532
Ecosystem
npm
Packages
@openai/codex
Severity
High
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-20
Reviewed
2025-09-19

Affected packages

• npm @openai/codex: >= 0.2.0, < 0.39.0 → fixed in 0.39.0

Description

Due to a bug in the sandbox configuration logic, Codex CLI could treat a model-generated `cwd` as the sandbox’s writable root, including paths outside of the folder where the user started their session. This logic bypassed the intended workspace boundary and enables arbitrary file writes and command execution where the Codex process has permissions - this did not impact the network-disabled sandbox restriction. Remediation We released a patch in Codex CLI 0.39.0 that canonicalizes and validates that the boundary used for sandbox policy is based on where the user started the session, and not the one generated by the model. Users running 0.38.0 or earlier should update immediately via their package manager or by reinstalling the latest Codex CLI to ensure sandbox boundaries are enforced. If using the Codex IDE extension, users should immediately update to 0.4.12 for a fix of the sandbox issue. Thank you to Tzanko Matev (Codetracer) for reporting the issue!

Related

Alias · CVE (1)

  • CVE-2025-59532 Codex CLI is a coding agent from OpenAI that runs locally. vulnerability

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References