CVEs / CVE-2026-87491
CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability
- Known exploited in the CISA KEV catalog since 9 Sep 2026
- high 8.8 CVSS 3.1 (from the CNA)
- EPSS 3.5% chance of exploitation in the next 30 days, higher than 89% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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)
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Google Chrome | from 153.0.8010.36, before 153.0.8010.36 | 153.0.8010.36 |
Exploitation
| In CISA KEV since | 9 Sep 2026 |
|---|---|
| Due date for US federal agencies | 23 Sep 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HScored by the CNA (134c704f-9b21-4f2e-91b3-4a467353bcc0) |
|---|---|
| Weakness | CWE-787 |
References
- CVE-2026-87491 on NVD
- CVE-2026-87491 in the CISA KEV catalog
- https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html Release Notes, Vendor Advisory
- https://issues.chromium.org/issues/543557673 Permissions Required
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.