CVE-2026-87491 Google Chromium V8 Out of Bounds Write

What is CVE-2026-87491?

CVE-2026-87491 is a high-severity memory corruption vulnerability in Google Chrome, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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)

Weakness: CWE-787

Which versions are affected by CVE-2026-87491?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-87491?

Upgrade to a fixed version. US federal agencies must fix it by 23 Sep 2026.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-87491 being exploited?

Yes. Attackers have exploited CVE-2026-87491 in the wild since at least 9 Sep 2026.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8
• CVE-2026-11645 Google Chromium V8 Out-of-Bounds Read and Write Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-87491, ECHO-3f1b-5c1c-631e, GHSA-8x3p-8g9v-xc7m, MINI-qm5x-wg7x-hq34.