---
id: "CVE-2026-121200"
kind: "vulnerability"
aliases: ["CVE-2026-121200"]
title: "Chrome: DevTools reference flaw lets a crafted page escape the sandbox"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browsers", "chrome", "desktop", "other"]
not_affected_if: ["chrome-updated"]
published_at: "2026-11-03T21:17:28+00:00"
first_seen_at: "2026-11-03T21:19:26+00:00"
updated_at: "2026-11-03T21:22:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121200", "first_seen_at": "2026-11-03T21:19:26+00:00"}]
---

# Chrome: DevTools reference flaw lets a crafted page escape the sandbox

Google Chrome's DevTools mishandles a reference, so a crafted HTML page can potentially run code outside the browser sandbox. Exploitation needs a remote attacker to use social engineering to get the victim to open the page.

_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 `chrome://version`; versions below `157.0.8103.38` are listed as affected.

## Fix

- Google Chrome: move to `157.0.8103.38` or later.

## Timeline

- 2026-11-03T21:19:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121200

## From the sources

Incorrect reference resolution in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

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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_