CVE-2026-75149 marimo < 0.23.15 Code Injection via MCP Server Configuration
Attackers can execute arbitrary commands by crafting a malicious MCP server entry in a marimo notebook, triggering execution upon opening the file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-75149?
CVE-2026-75149 is a high-severity code injection vulnerability in marimo-team marimo, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-94
Which versions are affected by CVE-2026-75149?
How do I fix CVE-2026-75149?
No fix has been published for CVE-2026-75149 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-75149 being exploited?
There is no known exploitation of CVE-2026-75149 in the wild and no public exploit code.
Sources
Also known as GHSA-gfgh-xp6v-q37q.