---
id: CVE-2026-67618
title: >-
  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 configu…
summary: >-
  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 configu…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-345
published: '2026-08-04'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:43.283'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67618'
references:
  - url: >-
      https://github.com/marimo-team/marimo/commit/1a21bd71e258438d2511136b5edacc94c08855f4
    label: disclosure@vulncheck.com
  - url: 'https://github.com/marimo-team/marimo/pull/10281'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/marimo-team/marimo/releases/tag/0.23.15'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/marimo-api-key-exfiltration-via-malicious-notebook-pep-723-metadata
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00295
epssPercentile: 0.1973
ingestedAt: '2026-09-16T13:56:12.584Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.