Critical
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-39987
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:26 UTC · Revision 1
Source evidence
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
core-osv · Original sourcePublished 9 Apr 2026, 17:16 UTC
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.
osv:CVE-2026-39987
Complete source record
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"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.",
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"modified": "2026-10-28T02:30:49.189447978Z",
"provider": "osv",
"references": [
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