CVE-2026-39987

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-39987
marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSocket endpoints (e.g., /ws) that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running mode and platform support before accepting connections, completely skipping authentication verification. This vulnerability is fixed in 0.23.0.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a Patch
https://github.com/marimo-team/marimo/pull/9098 Issue Tracking Patch
https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc Exploit Mitigation Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987 US Government Resource
https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours Exploit Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:coreweave:marimo:*:*:*:*:*:python:*:*
History

23 Apr 2026, 20:15

Type Values Removed Values Added
CPE cpe:2.3:a:coreweave:marimo:*:*:*:*:*:python:*:*
First Time Coreweave marimo
Coreweave
References () https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a - () https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a - Patch
References () https://github.com/marimo-team/marimo/pull/9098 - () https://github.com/marimo-team/marimo/pull/9098 - Issue Tracking, Patch
References () https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc - () https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc - Exploit, Mitigation, Vendor Advisory
References () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987 - () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987 - US Government Resource
References () https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours - () https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours - Exploit, Third Party Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8

23 Apr 2026, 19:17

Type Values Removed Values Added
References
  • {'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39987', 'source': '134c704f-9b21-4f2e-91b3-4a467353bcc0'}
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987 -

23 Apr 2026, 18:16

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39987 -
  • () https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours -

09 Apr 2026, 18:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-09 18:17

Updated : 2026-04-23 20:15

NVD link : CVE-2026-39987

Mitre link : CVE-2026-39987

CVE.ORG link : CVE-2026-39987

JSON object : View

Products Affected

coreweave

  • marimo
CWE
CWE-306

Missing Authentication for Critical Function