Marimo Notebook Flaw Could Run MCP Commands Before Cells Execute in Edit Mode

The Hacker News

August 25, 2026 at 12:43 PM

Overview

Marimo has fixed a serious security flaw in its notebook software that could allow attackers to run unauthorized commands. This vulnerability, identified by VulnCheck's CVE Numbering Authority, enables an attacker to execute Model Context Protocol (MCP) commands when a specially crafted notebook is opened in edit mode. If exploited, this could lead to unauthorized actions on a user's system, particularly affecting individuals using the notebook software in environments where sensitive data is handled. Users are urged to update their software promptly to mitigate potential risks associated with this flaw.

Key Takeaways

Affected Systems: Marimo notebook software
Action Required: Users should update to the latest version of the Marimo notebook software as soon as possible to address this vulnerability.
Timeline: Newly disclosed

Original Article Summary

Marimo has addressed a high-severity security flaw in its notebook software that allowed an attacker to execute an attacker-supplied Model Context Protocol (MCP) command in a specially crafted notebook, according to VulnCheck's CVE Numbering Authority (CNA) record. The CNA record says the command can run as a local subprocess when the notebook is opened in edit mode. The vulnerability, tracked

Impact

Marimo notebook software

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

Users should update to the latest version of the Marimo notebook software as soon as possible to address this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Update.

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