Vulnerability Description
marimo before 0.23.15 contains a configuration injection vulnerability that allows notebook authors to exfiltrate operator API keys by embedding a malicious base_url in PEP-723 inline script metadata, which is merged into session configuration with higher precedence than the operator's own settings due to insufficient sanitization in sanitize_pyproject_dict. When an operator opens the crafted notebook and makes an AI request, marimo resolves the attacker-controlled base_url from the notebook config while falling back to the operator's OPENAI_API_KEY environment variable for authentication, transmitting the API key to the attacker-controlled endpoint without requiring any cell execution.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/marimo-team/marimo/commit/1a21bd71e258438d2511136b5edacc94c08
- https://github.com/marimo-team/marimo/pull/10281
- https://github.com/marimo-team/marimo/releases/tag/0.23.15
- https://www.vulncheck.com/advisories/marimo-api-key-exfiltration-via-malicious-n
FAQ
What is CVE-2026-67618?
CVE-2026-67618 is a vulnerability with a CVSS score of 6.5 (MEDIUM). marimo before 0.23.15 contains a configuration injection vulnerability that allows notebook authors to exfiltrate operator API keys by embedding a malicious base_url in PEP-723 inline script metadata,...
How severe is CVE-2026-67618?
CVE-2026-67618 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67618?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.