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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0246
Remote code execution vulnerability in Marimo

Original Issue Date:May 19, 2026

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

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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