Marimo Remote Code Execution Vulnerability (CVE-2026-39987)
Severity: critical · Patch status: patched · Since 2026-04-23 · CVE-2026-39987
Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands. CISA added CVE-2026-39987 to its Known Exploited Vulnerabilities catalog on Apr 23, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by May 7, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch