critical9.8Known exploitedPublic exploit code
CVE-2026-39987
Marimo: Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-04-23. Federal due date: 2026-05-07.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- Marimo 0.20.4 - RCE2026-09-02 · webapps · multiple
Impact
Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | marimo | < 0.23.0 | 0.23.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Coreweave | Marimo | before 0.23.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- CISA KEV catalog
- https://github.com/advisories/GHSA-2679-6mx9-h9xc
- https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc
- https://github.com/marimo-team/marimo/pull/9098
- https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a
- https://nvd.nist.gov/vuln/detail/CVE-2026-39987
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39987
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987
- https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours