---
id: "CVE-2026-126840"
page: "https://infrastack.ai/live/CVE-2026-126840"
kind: "vulnerability"
aliases: ["CVE-2026-126840"]
title: "Google Chrome: out-of-bounds write in Network lets a web page run code"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browsers", "chrome", "end-users", "other"]
not_affected_if: ["chrome-157.0.8103.78-or-later"]
published_at: "2026-11-11T23:17:11+00:00"
first_seen_at: "2026-11-11T23:29:35+00:00"
updated_at: "2026-11-11T23:33:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126840", "first_seen_at": "2026-11-11T23:29:35+00:00"}]
exploit_sources: []
---

# Google Chrome: out-of-bounds write in Network lets a web page run code

Link for people: https://infrastack.ai/live/CVE-2026-126840 (this .md is for agents)

A memory write past the end of a buffer in Chrome's Network component lets a crafted HTML page run code inside the browser sandbox. Chromium rates it High severity.

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

## How to check

- Open Chrome and go to `chrome://settings/help` to read the installed version
- Confirm the version is `157.0.8103.78` or later

## Fix

- Google Chrome: move to `157.0.8103.78` or later

## Timeline

- 2026-11-11T23:29:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126840

## From the sources

Out of bounds write in Network in Google Chrome prior to 157.0.8103.78 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_