CVE-2026-19592 Command injection in Codex CLI
Attacker-controlled Git fsmonitor helper executes arbitrary code with user privileges when opening a malicious repository in Codex CLI or Desktop.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19592?
CVE-2026-19592 is a high-severity command injection vulnerability in OpenAI Codex CLI, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
OpenAI Codex CLI for Windows, macOS, and Linux and Codex Desktop for Windows and macOS automatically collected Git repository metadata without disabling the repository-local core.fsmonitor setting. If a user opens or uses an attacker-prepared repository whose preserved .git/config sets core.fsmonitor to an attacker-controlled filesystem-monitor helper, Git can execute that helper while Codex collects repository metadata. The helper runs outside Codex's command sandbox and without a user-approval prompt, allowing attacker-controlled code to run with the user's privileges. The code can read, change, or delete the user's files and access other resources available to the user's account. An ordinary Git clone does not preserve the source repository's local .git/config; exploitation requires a repository delivered or copied with that configuration intact.
Weakness: CWE-15
Which versions are affected by CVE-2026-19592?
How do I fix CVE-2026-19592?
No fix has been published for CVE-2026-19592 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-19592 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19592 exists.
Sources
Also known as GHSA-26wp-42v3-96xp.