CVE-2026-19591: OpenAI Codex CLI vulnerability
OpenAI · Codex CLI
Vendor fix available · Affected: OpenAI Codex CLI · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 47% of scored CVEs
DescriptionCVE.org
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.
Affected products4
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- OpenAI · Codex CLIfrom 0.72.0 up to and including 0.130.0
- OpenAI · Codex Desktopfrom 260202.0859 up to and including 26.513.31313
- OpenAI · Codex Desktopfrom 26.304.38 up to and including 26.513.40821
- OpenAI · Codex Desktop (Microsoft Store package)from 26.304.38.0 up to and including 26.513.4821.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- OpenAI
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-19591 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.