Google Chromium V8 Out of Bounds Write Vulnerability
Google Chromium V8 contains an out of bounds write vulnerability that allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
- Vendor
- Product
- Chromium V8
- CVSS
- 8.8
- EPSS (exploit probability)
- 3.5%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2026-87491 being exploited?
Yes. CISA added CVE-2026-87491 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 3.5% (scored October 25, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-28. Full cross-catalog view: /kev-comparison
CVE-2026-87491 timeline
- Added to CISA KEVsame day as NVD
- Published to NVD
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Google Chromium V8 CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-11645 Google Chromium V8 Out-of-Bounds Read and Write Vulnerability | [ HIGH ] | 8.8 | 2.4% | |
| CVE-2026-3910 Google Chromium V8 Improper Restriction of Operations Within the Bounds of a Memory Buffer Vulnerability | [ HIGH ] | 8.8 | 2.7% | |
| CVE-2025-13223 Google Chromium V8 Type Confusion Vulnerability | [ HIGH ] | 8.8 | 4.9% | |
| CVE-2025-10585 Google Chromium V8 Type Confusion Vulnerability | [ CRITICAL ] | 9.8 | 9.0% | |
| CVE-2025-6554 Google Chromium V8 Type Confusion Vulnerability | [ HIGH ] | 8.1 | 14.1% | |
| CVE-2025-5419 Google Chromium V8 Out-of-Bounds Read and Write Vulnerability | [ HIGH ] | 8.8 | 7.8% | |
| CVE-2024-7965 Google Chromium V8 Inappropriate Implementation Vulnerability | [ HIGH ] | 8.8 | 18.5% | |
| CVE-2024-7971 Google Chromium V8 Type Confusion Vulnerability | [ CRITICAL ] | 9.6 | 21.0% |