---
id: "CVE-2026-118321"
kind: "vulnerability"
aliases: ["CVE-2026-118321"]
title: "Chrome on Android: input validation flaw lets crafted page escape sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["android", "browsers", "chrome", "mobile", "runtime"]
not_affected_if: ["already-on-156.0.8078.73", "desktop-only"]
published_at: "2026-10-27T23:17:00+00:00"
first_seen_at: "2026-10-27T23:29:43+00:00"
updated_at: "2026-10-27T23:31:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118321", "first_seen_at": "2026-10-27T23:29:43+00:00"}]
---

# Chrome on Android: input validation flaw lets crafted page escape sandbox

Improper input validation in the Core component of Google Chrome on Android, before 156.0.8078.73, lets a remote attacker run code outside the browser sandbox. The attack is triggered by a crafted HTML page the victim opens.

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

## How to check

- Open Chrome on the Android device and check the version under Settings > About Chrome, or run `adb shell dumpsys package com.android.chrome | grep versionName` from a workstation
- Compare the reported version against `156.0.8078.73`; anything lower is affected

## Fix

- Update Google Chrome on Android to `156.0.8078.73` or later through the Play Store
- Update any WebView-based apps that bundle or depend on the Chromium WebView component, if the sources or vendor notes apply to them (unknown from the sources)

## Timeline

- 2026-10-27T23:29:43+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118321

## From the sources

Improper input validation in Core in Google Chrome on on Android prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code outside 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_