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CVE-2026-39987: Marimo Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2026-39987
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.

CSIRTS triage

vendor: Marimoproduct: MarimoRemote code execution
What
The vulnerability allows an unauthenticated attacker to gain shell access and execute arbitrary system commands.
Who is affected
Users of Marimo are affected.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and its exploitation status.
Action
Apply the available patch immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-04-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-39987

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-39987coverage & exploitation statusNVD · CVE.org

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