Chromium CVE-2026-87491: Out of bounds write in V8
Published September 11, 2026Updated September 11, 2026
Source data
Overview
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information. Google is aware that an exploit for CVE-2026-87491 exists in the wild.
Impact & technical details
A separate impact classification is not supplied in this record. See the source advisory.
Why is this Chrome CVE included in the Security Update Guide? The vulnerability assigned to this CVE is in Chromium Open Source Software (OSS) which is consumed by Microsoft Edge (Chromium-based). It is being documented in the Security Update Guide to announce that the latest version of Microsoft Edge (Chromium-based) is no longer vulnerable. How can I see the version of the browser? In your Microsoft Edge browser, click on the 3 dots (...) on the very right-hand side of the window Click on Help and Feedback Click on About Microsoft Edge
What is the version information for this release? Microsoft Edge Version Date Released Based on Chromium Version 152.0.4191.66 09/04/2026 152.0.7977.83
- CVSS base score
- Not supplied
Affected products
- Microsoft Edge (Chromium-based)
Source guidance
Remediation
- Release Notes
- Apply 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.
Patch availability is not confirmed by this dataset. Consult the vendor before selecting a remediation.
GTP recommendation · Rule-based guidance
Recommended next step
Prioritize an applicability review and follow the vendor mitigations and CISA required action. Confirm update availability with the vendor.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
- Microsoft Security Response Center (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- CISA Known Exploited Vulnerabilities (opens in a new tab)
- Authoritative advisory (opens in a new tab)
- Authoritative advisory (opens in a new tab)
- NIST National Vulnerability Database (opens in a new tab)
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.