---
id: "CVE-2026-121131"
kind: "vulnerability"
aliases: ["CVE-2026-121131"]
title: "Chrome for Android: use-after-free lets a crafted extension run code"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["android", "browser-extensions", "chrome", "mobile", "package"]
not_affected_if: ["chrome-up-to-date", "no-untrusted-extensions"]
published_at: "2026-11-03T21:17:21+00:00"
first_seen_at: "2026-11-03T21:19:21+00:00"
updated_at: "2026-11-03T21:24:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121131", "first_seen_at": "2026-11-03T21:19:21+00:00"}]
---

# Chrome for Android: use-after-free lets a crafted extension run code

A use-after-free bug in the mobile build of Google Chrome lets an attacker who tricks a user into installing a crafted Chrome extension run arbitrary code outside the browser sandbox. Chromium rates it High severity.

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

## How to check

- Check the Chrome version on the device: open chrome://version and compare against `157.0.8103.38`
- Review installed extensions on managed devices for unfamiliar or sideloaded ones

## Fix

- Chrome Mobile: move to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121131

## From the sources

Use after free in Mobile in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to execute arbitrary code outside the sandbox via a crafted Chrome extension. (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_