CVE-2026-39987 (GCVE-0-2026-39987)

Vulnerability from cvelistv5 – Published: 2026-04-09 17:16 – Updated: 2026-04-24 03:55
VLAI
Title
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
Summary
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.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-23 00:00 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
marimo-team marimo Affected: < 0.23.0
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Show details on NVD website
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