Codex has sandbox bypass due to bug in path configuration logic
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!
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | @openai/codex | >= 0.2.0, < 0.39.0 | 0.39.0 |
Referencias
- Vector CVSS
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- Debilidad (CWE)
CWE-20- Plataforma
- npm
- Paquete
@openai/codex- Publicada
- 19.09.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-w5fx-fh39-j5rw - CC BY 4.0
Historial de vulnerabilidades: @openai/codex
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 09.2025 04.2026
- Sin corrección
- 1
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 1
Divulgaciones por año
- 2025: 1
- 2026: 1
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Codex has sandbox bypass due to bug in path configuration logic esta entrada
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