What EVULNABLE says
Listed in the CISA KEV catalog, and an EPSS probability of 0.989.
Out-of-Band / Urgent Remediation
CVE-2026-39987
Marimo — Marimo Remote Code Execution Vulnerability
CISA KEV · in the CISA KEV catalog since 2026-04-23
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
The evidence behind it
| Measure | Value | Source |
|---|---|---|
| CVSS base score | 9.3 | NVD |
| FIRST EPSS | 0.989 (99.93rd pctl) | FIRST |
| Actively exploited | Confirmed | CISA KEV |
| Ransomware campaign use | Unknown or none | CISA KEV |
| CISA remediation deadline | 2026-05-07 — Overdue by 4 months | CISA KEV |
What CISA says to do
The primary records
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2026-39987 is one of the entries ranked on the priority feed and in the non-Microsoft advisories.