(Pwn2Own) OpenAI Codex Improper Neutralization of Control Sequences Remote Code Execution Vulnerability

September 10th, 2026
ZDI-26-649 ZDI-CAN-31270

CVE ID

CVE-2026-19591

CVSS Score

7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors

OpenAI

Affected Products

Codex

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of OpenAI Codex. User interaction is required to exploit this vulnerability in that the target must open a malicious folder.

The specific flaw exists within the parsing of arguments provided to git commands. The issue results from insufficient neutralization of control sequences. An attacker can leverage this vulnerability to execute code in the context of the current user.

Additional Details

OpenAI has issued an update to correct this vulnerability. More details can be found at:
https://www.cve.org/CVERecord?id=CVE-2026-19591

Disclosure Timeline

  • 2026-06-02 - Vulnerability reported to vendor
  • 2026-09-10 - Coordinated public release of advisory
  • 2026-09-10 - Advisory Updated

Credit

Cyrill Bannwart, Emanuele Barbeno, Yves Bieri, Lukasz D., Urs Mueller of Compass Security

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