Vulnerabilities
Vulnerable Software

Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.455
EPSS Ranking 97.6%
CVSS Severity
CVSS v3 Score 9.8
Proposed Action
Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.
Ransomware Campaign
Unknown
Products affected by CVE-2026-39987


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