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cve recordhighexploited in the wildzero day3 of 3 cataloguesexploit reported

CVE-2026-39987

Marimo · Marimo · Marimo Remote Code Execution Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS37.9%98.5th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueMay 7, 2026
patch window

Called exploited the same day it was disclosed.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listingsame day
  3. Last KEV listing14d
  4. Last sighting4mo

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by14 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

20 public reports collected from VulnCheck and CIRCL, first on Apr 9, 2026. Each links to its original source. We have not verified them.

Description

Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

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Our coverage of CVE-2026-39987

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