CVE-2026-87491
Google — Google Chromium V8 Out of Bounds Write Vulnerability
CISA KEV · in the CISA KEV catalog since 2026-09-09
What EVULNABLE says
Listed in the CISA KEV catalog, and Confirmed exploitation in the wild.
Patch This Cycle
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 | 5.5 | Chrome |
| FIRST EPSS | 0.003 (21.4th pctl) | FIRST |
| Actively exploited | Confirmed | CISA KEV |
| Ransomware campaign use | Unknown or none | CISA KEV |
| CISA remediation deadline | 2026-09-23 — CISA deadline in 13 days | CISA KEV |
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-2026-87491 is one of the entries ranked on the priority feed and in the non-Microsoft advisories.