CVE-2026-75149Network attack vector

Command execution via notebook MCP configuration

Published Aug 19, 2026 · Updated Aug 19, 2026

Code injection in the notebook configuration handler in Marimo before 0.23.15 allows attackers to execute commands via a crafted notebook. PEP 723 notebook metadata is merged with highest precedence into operator configuration, and the prior ScriptConfigManager sanitizer stripped only tool.marimo.runtime.auto_instantiate, leaving attacker-supplied tool.marimo.mcp entries and related sections to pass through unchecked. Opening the notebook in edit mode is enough to launch the configured subprocess before any cell runs, so notebook authors can trigger local code execution on hosts that review untrusted notebooks.

CVSS severity8.7
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in the notebook configuration handler in Marimo before 0.23.15 allows attackers to execute commands via a crafted notebook. PEP 723 notebook metadata is merged with highest precedence into operator configuration, and the prior ScriptConfigManager sanitizer stripped only tool.marimo.runtime.auto_instantiate, leaving attacker-supplied tool.marimo.mcp entries and related sections to pass through unchecked. Opening the notebook in edit mode is enough to launch the configured subprocess before any cell runs, so notebook authors can trigger local code execution on hosts that review untrusted notebooks.

The record

CVE
CVE-2026-75149
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Marimo Inc.
Product
marimo
Classifications
CWE-94, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.23.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marimo Inc. · marimoversion=0 <0.23.15

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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