High
marimo < 0.23.15 API Key Exfiltration via Malicious Notebook PEP-723 Metadata
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67618
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:24 UTC · Revision 1
Source evidence
marimo < 0.23.15 API Key Exfiltration via Malicious Notebook PEP-723 Metadata
core-osv · Original sourcePublished 4 Aug 2026, 14:30 UTC
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.
osv:CVE-2026-67618
Complete source record
{
"id": "da2e7247e70b171a1d354c027bcce0854aa263f283e2d4197808fe504a82c968",
"url": "https://osv.dev/vulnerability/CVE-2026-67618",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "marimo < 0.23.15 API Key Exfiltration via Malicious Notebook PEP-723 Metadata",
"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 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.",
"evidence": "osv:CVE-2026-67618",
"products": [],
"severity": "high",
"structured": {
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],
"modified": "2026-10-28T02:30:22.002335176Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67618.json",
"https://github.com/marimo-team/marimo/releases/tag/0.23.15",
"https://nvd.nist.gov/vuln/detail/CVE-2026-67618",
"https://www.vulncheck.com/advisories/marimo-api-key-exfiltration-via-malicious-notebook-pep-723-metadata",
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"provider_metadata": {
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"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67618.json"
}
},
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"evidence": "/id"
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},
"source_id": "core-osv",
"document_id": 488319,
"published_at": "2026-08-04T14:30:48.244+00:00"
}