---
id: "CVE-2026-113300"
kind: "vulnerability"
aliases: ["CVE-2026-113300"]
title: "Chrome: out-of-bounds write in Forms lets a web page run code"
severity: "critical"
cvss: 9.6
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "google chrome", "fixed": ["156.0.8078.47"], "affected": "< 156.0.8078.47", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browser", "chrome", "linux", "macos", "other", "package", "windows"]
not_affected_if: ["chrome-already-updated"]
published_at: "2026-10-20T22:19:24+00:00"
first_seen_at: "2026-10-23T21:57:24+00:00"
updated_at: "2026-10-23T22:35:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113300", "first_seen_at": "2026-10-23T21:57:24+00:00"}]
---

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

A crafted HTML page can trigger an out-of-bounds write in Chrome's Forms component, which can let a remote attacker execute arbitrary code outside the browser sandbox. The source reports a CVSS score of 9.6 (critical), while Chromium rates its own severity as Low.

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

## Affected

- vendor:google chrome affected < 156.0.8078.47 fixed 156.0.8078.47

## How to check

Run chrome://version in Chrome and check whether the version is below 156.0.8078.47.
On managed machines, check the installed Chrome version with the platform's software inventory tool.

## Fix

Update Google Chrome to 156.0.8078.47 or later and restart the browser.

## Timeline

- 2026-10-23T21:57:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113300

## From the sources

Out of bounds write in Forms in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Low)

---

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