CVE entry · CVE-2026-39987
CVE-2026-39987: Marimo Remote Code Execution Vulnerability
Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.
- Actively exploited: added to CISA’s KEV catalog on April 23, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: May 7, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Marimo, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.