CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability
Vulnerability summary
CVE-2026-87491 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in Google Chromium V8. It is known to be exploited: CISA lists it, first on 09-09-2026. EPSS estimates a 3.51% chance of exploitation in the next 30 days, higher than 89.2% of scored vulnerabilities.
Listed as exploited by CISA (09-09-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 09-09-2026PublishedVulnerability first disclosed.
- 09-09-2026Added to CISA KEVExploitedGoogle Chromium V8 Out of Bounds Write Vulnerability
- 21-09-2026Last modifiedVulnerability information updated.
- 23-09-2026CISA remediation dueDeadline passedApply mitigations per vendor instructions.
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)
CVSS metrics
3 scores · 3 sources · 1 version- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
3.51%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
Increase +0.37 pp
From 3.14% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 09-09-2026
- Federal due date
- 23-09-2026
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
CISA 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. chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html nvd.nist.gov/vuln/detail/CVE-2026-87491
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard1 product
- chromium< 153.0.8010.36-r0
Debian1 product
- chromium< 153.0.8010.52-1~deb12u1 | < 153.0.8010.47-2~deb13u1 | < 153.0.8010.47-1
Google1 product
- chrome≥ 153.0.8010.36, < 153.0.8010.36 | < 153.0.8010.36
Wolfi1 product
- chromium< 153.0.8010.36-r0
4 vendors · 4 products
References
4 links- chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.htmlRelease NotesVendor Advisory
- issues.chromium.org/issues/543557673Permissions Required
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491Government ResourceUS Government Resource
