---
id: "CVE-2026-121140"
kind: "vulnerability"
aliases: ["CVE-2026-121140"]
title: "Chrome: out-of-bounds read lets a compromised renderer escape the sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "desktop", "endpoints", "runtime"]
not_affected_if: ["chrome-157.0.8103.38-or-later"]
published_at: "2026-11-03T21:17:22+00:00"
first_seen_at: "2026-11-03T21:19:22+00:00"
updated_at: "2026-11-03T21:24:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121140", "first_seen_at": "2026-11-03T21:19:22+00:00"}]
---

# Chrome: out-of-bounds read lets a compromised renderer escape the sandbox

An out-of-bounds read in Chrome's Internals component, in versions before 157.0.8103.38, can be triggered by a crafted HTML page. An attacker who has already compromised the renderer process could use it to run code outside the browser sandbox.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Chrome version in the browser's About page or with `google-chrome --version`
- Confirm the version is below `157.0.8103.38`

## Fix

- Google Chrome: move to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121140

## From the sources

Out of bounds read in Internals in Google Chrome prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_