Google Chromium V8 Out of Bounds Write Vulnerability

Google Chromium V8

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. Added to CISA KEV on 2026-09-09 (federal deadline 2026-09-23).

First seen: 9 Sept 2026
Last update: 9 Sept 2026, 12:00 UTC
Identifiers: CVE-2026-87491
Source: CISA KEV
On the menu as: Chrome

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## Google Chromium V8 Out of Bounds Write Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Google Chromium V8
Ids: CVE-2026-87491

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. Added to CISA KEV on 2026-09-09 (federal deadline 2026-09-23).

## Steps
1. Search the repo, its CI and infra config for Google Chromium V8. If present, report the version in use and whether it's affected.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-87491") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html https://nvd.nist.gov/vuln/detail/CVE-2026-87491
https://pwned.coffee/i/google-chromium-v8-out-of-bounds-write-vulnerability-cve-2026-87491

Sources

Totalone hot coffee