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

Status: published. Published: 2026-08-19. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/marimo-team/marimo/pull/10281
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/marimo-team/marimo/commit/1a21bd71e258438d2511136b5edacc94c08855f4

## Affected products and versions

- marimo-team / marimo (marimo-team/marimo): ≥ 0; < 0.23.15 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.96% as of 2026-11-08; percentile 61.84%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-94

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/marimo-team/marimo/releases/tag/0.23.15 (CNA: VulnCheck; release-notes)

- https://github.com/marimo-team/marimo/pull/10281 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/marimo-team/marimo/commit/1a21bd71e258438d2511136b5edacc94c08855f4 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/marimo-code-injection-via-mcp-server-configuration (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-75149; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-75149; retrieved 2026-11-08; source updated Not reported

Revision: 6519044185b11684371a6699f9a34d11b756bd815e0de0d6a3cb1216952c0dc2

Canonical: https://y2.dev/cve/CVE-2026-75149

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