---
id: "CVE-2026-121221"
kind: "vulnerability"
aliases: ["CVE-2026-121221"]
title: "Chrome: V8 type confusion lets a crafted web page run code"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "runtime", "v8"]
not_affected_if: ["chrome-updated"]
published_at: "2026-11-03T21:17:31+00:00"
first_seen_at: "2026-11-03T21:19:27+00:00"
updated_at: "2026-11-03T21:21:29+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121221", "first_seen_at": "2026-11-03T21:19:27+00:00"}]
---

# Chrome: V8 type confusion lets a crafted web page run code

A type confusion bug in the V8 JavaScript engine of Google Chrome lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. 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 check the version under Settings > About Chrome, or run `google-chrome --version` on Linux
- Compare the installed version against `157.0.8103.38`

## Fix

- Google Chrome: move to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121221

## From the sources

Type confusion in V8 in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code inside 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_