CVE-2026-87491
Google Chromium V8 Out of Bounds Write Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
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.
CISA notes
https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-87491
Description
Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation Context
as of October 14, 2026- CISA added CVE-2026-87491 to the KEV catalog on the day its CVE record was published. The median for entries added in 2026 so far is 15 days.
- It is one of 75 Google entries in the CISA KEV catalog, and one of 8 added in 2026.
- Its current EPSS score (3.1%) is higher than that of 12% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
Google Chrome | 153.0.8010.36 to <153.0.8010.36 |
References
2 LinksRecord Details
More from Google
Google Chromium V8 Remote Code Execution Vulnerability
Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8 Improper Input Validation Vulnerability
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