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.
Marimo versions References: https://github.com/advisories/GHSA-2679-6mx9-h9xc https://nvd.nist.gov/vuln/detail/CVE-2026-39987 https://github.com/marimo-team/marimo Remediation: Upgrade to Marimo version 0.23.0 or later which adds authentication validation to the terminal WebSocket endpoint.
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