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Remote code execution vulnerability in Marimo

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Software Affected

marimo (pip) versions prior to 0.23.0

Overview

A vulnerability has been reported in Marimo, which could allow an unauthenticated attacker to execute arbitrary commands on the targeted system.

Target Audience:

All end-user organizations and individuals using affected marimo package.

Risk Assessment:

High risk of remote code execution, unauthorized access, and full system compromise

Impact Assessment:

Potential for complete system takeover, execution of arbitrary commands, sensitive information disclosure, and service disruption.

Description

Marimo is a reactive Python notebook environment that automatically updates dependent cells when code or inputs change, ensuring consistent and reproducible execution. It stores notebooks as pure Python files, supports interactive data workflows, and can be run as scripts or deployed as web apps.

This vulnerability exists in Marimo due to improper authentication handling in the terminal WebSocket endpoint (/terminal/ws). A remote attacker could exploit this by connecting to the vulnerable endpoint and gaining access to a full pseudo-terminal (PTY) shell.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary commands on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc

Vendor Information

Marimo

https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc

References

Marimo

https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc

CVE Name

CVE-2026-39987

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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