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Multiple Remote Code Execution Vulnerabilities in OpenAI Codex Disclosed

First seen 10 Sep 2026, 13:46 UTC • •

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ThreatCluster AI
ThreatCluster •September 11, 2026 at 12:47 UTC
  • •Four remote code execution vulnerabilities in OpenAI Codex disclosed on September 10, 2026.
  • •User interaction is required for exploitation, either by opening malicious folders or files.
  • •OpenAI has released updates to mitigate these vulnerabilities.

Four vulnerabilities affecting OpenAI Codex have been disclosed, all allowing remote code execution via user interaction. These vulnerabilities arise from improper handling of control sequences and lack of sanitization of configuration settings. Users must either open a malicious folder or visit a malicious page to exploit these vulnerabilities. The vulnerabilities are identified as ZDI-26-649, ZDI-26-648, ZDI-26-651, and ZDI-26-650, with the first two requiring interaction with malicious files or pages, while the latter two involve malicious folders. OpenAI has issued updates to address these vulnerabilities. The advisories were publicly released on September 10, 2026, following their reporting to the vendor on June 2, 2026. The vulnerabilities impact installations of OpenAI Codex, potentially allowing attackers to execute arbitrary code in the context of the current user.

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Timeline

2026-06-02
Vulnerability reported to vendor
Multiple vulnerabilities affecting OpenAI Codex were reported to OpenAI for remediation.
Zerodayinitiative
2026-09-10
Coordinated public release of advisories
OpenAI Codex vulnerabilities ZDI-26-649, ZDI-26-648, ZDI-26-651, and ZDI-26-650 were publicly disclosed.
Zerodayinitiative
2026-09-10
Advisories updated
The advisories were updated to include the latest information regarding the vulnerabilities and patches.
Zerodayinitiative

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