Vulnerability · Published Aug 19, 2026 · Assigned by VulnCheck

CVE-2026-75149marimo < 0.23.15 Code Injection via MCP Server Configuration

High 8.8

In plain English

A high-severity code injection in marimo from marimo-team. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.0%top 38.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

marimo before 0.23.15 contains a code injection vulnerability in the notebook configuration handler that allows attackers to execute arbitrary commands by supplying a crafted MCP server entry with an attacker-controlled command value embedded in a notebook. When the notebook is opened in edit mode, marimo launches the specified command as a local subprocess before any notebook cell is executed, requiring no authentication or cell execution to trigger the vulnerability.

Affected products (as reported)

Vendor	Product	Versions
marimo-team	marimo	0 – before 0.23.15

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

marimo 0.23.15 Release Notes release-notes
Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/marimo-code-injection-via-mcp-server-configuration third-party-advisory