CVE-2026-19591OpenAI Codex CLI for Windows, macOS, and Linux and Codex Desktop for Windows and macOS misclassified certain PowerShell commands as safe because their command-safety parser interpreted PowerShell's s…
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It affects OpenAI Codex CLI and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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OpenAI Codex CLI for Windows, macOS, and Linux and Codex Desktop for Windows and macOS misclassified certain PowerShell commands as safe because their command-safety parser interpreted PowerShell's stop-parsing token (--%) differently than PowerShell itself. If a user opens an attacker-prepared repository and Codex follows its instructions, Codex can run a file-writing Git command without requesting user approval. On macOS and Linux, exploitation additionally requires separately installed PowerShell Core (pwsh) to be invoked. If filesystem protections permit the write, the command can modify Codex's configuration. If Codex later loads the modified configuration, it can launch an attacker-controlled MCP server and execute code with the user's privileges, allowing it to read, change, or delete files accessible to that account. The approval bypass does not disable filesystem sandboxing; the default filesystem sandbox on macOS and Linux can prevent writes outside permitted locations.
- CVSS
- 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-150
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- OAI
- NVD analysis
- Undergoing Analysis
- Record last updated
- Sep 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OpenAI Codex CLI openai:codex_cli (from the name) | from 0.72.0 through 0.130.0; 0.131.0 not affected | CNA record |
OpenAI Codex Desktop openai:codex_desktop (from the name) | 260202.0859 builds before 26.513.31313; 26.519.22136 not affected | CNA record |
OpenAI Codex Desktop (Microsoft Store package) openai:codex_desktop_microsoft_store_package (from the name) | from 26.304.38.0 through 26.513.4821.0; 26.519.2081.0 not affected | CNA record |
References
- https://github.com/openai/codex/pull/22643
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.