CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-87491
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-87491Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 21% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-87491 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedGoogle Chrome Multiple Vulnerabilitieshkcert
- unknownexploitedGoogle security advisory (AV26-904)cccs
- highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
- unknownexploitedNCSC-2026-0354 [1.00] [M/H] Kwetsbaarheid verholpen in Google Chromencsc-nl
- highexploitedCVE-2026-87491: Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to…nvd
- unknownexploitedMultiples vulnérabilités dans Google Chrome (09 septembre 2026)cert-fr-avis
Recent advisories for Google Chromium
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-87656: Improper state validation in Safebrowsing in Google Chrome prior to 153.0.8010.36 allowed a re…nvd · 2026-09-09
- mediumCVE-2026-87655: Clickjacking in Downloads in Google Chrome prior to 153.0.8010.36 allowed a remote attacker le…nvd · 2026-09-09
- mediumCVE-2026-87653: UI misrepresentation in FullScreen in Google Chrome on on Windows prior to 153.0.8010.36 allow…nvd · 2026-09-09
- mediumCVE-2026-87651: Incorrect authorization in Paint in Google Chrome prior to 153.0.8010.36 allowed a remote atta…nvd · 2026-09-09
- unknownCVE-2026-87645: Improper state validation in Safebrowsing in Google Chrome prior to 153.0.8010.36 allowed a re…nvd · 2026-09-09
- mediumCVE-2026-87642: Uninitialized resource in WebGL in Google Chrome prior to 153.0.8010.36 allowed a remote attac…nvd · 2026-09-09
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