GHSA-2679-6mx9-h9xc: Marimo: Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass

April 8, 2026

Marimo (19.6k stars) 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.

References

github.com/advisories/GHSA-2679-6mx9-h9xc
github.com/marimo-team/marimo
github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a
github.com/marimo-team/marimo/pull/9098
github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc

Code Behaviors & Features

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