---
id: "CVE-2026-121126"
kind: "vulnerability"
aliases: ["CVE-2026-121126"]
title: "Chrome: use-after-free in Core lets a crafted page run code"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "chrome", "desktop", "linux", "macos", "runtime", "windows"]
not_affected_if: ["chrome-at-or-above-157.0.8103.38"]
published_at: "2026-11-03T21:17:20+00:00"
first_seen_at: "2026-11-03T21:19:19+00:00"
updated_at: "2026-11-03T21:24:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121126", "first_seen_at": "2026-11-03T21:19:19+00:00"}]
---

# Chrome: use-after-free in Core lets a crafted page run code

A memory bug in Chrome's Core component, fixed in 157.0.8103.38, lets a remote attacker serve a crafted HTML page that can execute arbitrary code outside the browser sandbox. Chromium rates it Critical.

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

## How to check

- Check the installed Chrome version in chrome://settings/help or with `google-chrome --version`
- Compare it against `157.0.8103.38`

## Fix

- Google Chrome: move to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121126

## From the sources

Use after free in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

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