---
id: "CVE-2026-121055"
kind: "vulnerability"
aliases: ["CVE-2026-121055"]
title: "Chrome: DevTools cleanup flaw lets a crafted extension bypass access limits"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["browser-extensions", "chrome", "desktop", "package"]
not_affected_if: ["chrome-updated", "no-untrusted-extensions"]
published_at: "2026-11-03T21:17:10+00:00"
first_seen_at: "2026-11-03T21:19:10+00:00"
updated_at: "2026-11-03T21:27:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121055", "first_seen_at": "2026-11-03T21:19:10+00:00"}]
---

# Chrome: DevTools cleanup flaw lets a crafted extension bypass access limits

Google Chrome's DevTools did not fully clean up after itself, so a crafted Chrome extension can get around system access restrictions. Chromium rates it Low severity.

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

## How to check

- Check the Chrome version under chrome://settings/help and compare it with `157.0.8103.38`
- Review installed extensions at chrome://extensions for ones you do not recognize

## Fix

- Google Chrome: move to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:10+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121055

## From the sources

Incomplete cleanup in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass system access restrictions via a crafted Chrome extension. (Chromium security severity: Low)

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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_