CVE-2026-13870 Overview
CVE-2026-13870 is a use-after-free vulnerability in the WebView component of Google Chrome on Android. The flaw affects Chrome versions prior to 150.0.7871.47. A remote attacker can exploit the vulnerability by serving a crafted HTML page to a targeted user. Successful exploitation allows arbitrary code execution inside the Chrome sandbox on Android devices. The vulnerability is tracked under CWE-416 and requires user interaction to trigger.
Critical Impact
Attackers can execute arbitrary code within the Chrome sandbox on Android by luring users to a malicious web page, providing a foothold for further exploitation.
Affected Products
- Google Chrome for Android versions prior to 150.0.7871.47
- Google Android platform hosting affected Chrome WebView builds
- Applications embedding the vulnerable Android WebView component
Discovery Timeline
- 2026-06-30 - CVE-2026-13870 published to the National Vulnerability Database
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-13870
Vulnerability Analysis
The vulnerability is a use-after-free condition in the WebView component of Chrome on Android. WebView renders web content inside native Android applications and shares much of its rendering pipeline with Chrome. A use-after-free occurs when code continues to reference memory that has already been released. Attackers who control the timing of allocation and deallocation can reclaim the freed region with attacker-controlled data. When the dangling pointer is dereferenced, the process operates on that attacker-controlled memory. This behavior can be steered toward arbitrary code execution inside the renderer sandbox.
Root Cause
The root cause is improper object lifetime management within WebView, classified as [CWE-416] Use After Free. Rendering code retains a reference to an object after that object has been freed, allowing later access to reused memory. Chromium security engineering rates the underlying issue as Medium severity.
Attack Vector
Exploitation requires a victim to load a crafted HTML page in a vulnerable Chrome or WebView-backed Android application. No privileges are required, and the attack is delivered over the network. User interaction is limited to visiting the malicious page or opening in-app content that loads it. Successful exploitation yields code execution constrained by the Chrome sandbox, which attackers typically pair with a sandbox escape for full device compromise.
No verified public proof-of-concept code is currently referenced in the advisory. Technical details are tracked in the Chromium Issue Tracker entry 497634837 and the Google Chrome Update Announcement.
Detection Methods for CVE-2026-13870
Indicators of Compromise
- Chrome for Android clients still reporting a version string below 150.0.7871.47 in HTTP User-Agent headers or MDM inventory.
- Unexpected renderer process crashes in Chrome or WebView-backed applications shortly after loading external HTML content.
- Outbound connections from mobile endpoints to newly registered domains hosting suspicious HTML or JavaScript payloads.
Detection Strategies
- Inventory Android endpoints and enterprise apps that embed WebView, then compare installed Chrome and WebView versions against the fixed build 150.0.7871.47.
- Monitor mobile threat defense telemetry for anomalous crashes in com.android.chrome and applications using android.webkit.WebView.
- Correlate web proxy logs with threat intelligence to flag users visiting URLs associated with exploit kits targeting mobile browsers.
Monitoring Recommendations
- Enable centralized logging of Android application crash reports and forward them to your SIEM for correlation.
- Track Chrome and Android System WebView update compliance through enterprise mobility management dashboards.
- Alert on user visits to uncategorized or newly observed domains from managed mobile devices.
How to Mitigate CVE-2026-13870
Immediate Actions Required
- Update Google Chrome for Android and Android System WebView to version 150.0.7871.47 or later through the Google Play Store.
- Push forced updates through your mobile device management platform to accelerate rollout to managed devices.
- Restrict access to untrusted web content from corporate mobile devices until patching is verified.
Patch Information
Google addressed CVE-2026-13870 in Chrome 150.0.7871.47. Details are published in the Google Chrome Update Announcement. Android System WebView updates are delivered independently through Google Play and must be applied alongside the Chrome update.
Workarounds
- Advise users to avoid clicking links from untrusted sources on Android until updates are applied.
- Configure enterprise browsing policies to block navigation to uncategorized domains from managed devices.
- Where feasible, use secure browsing containers or isolate WebView-backed applications from sensitive corporate data.
# Verify installed Chrome version on a managed Android device via ADB
adb shell dumpsys package com.android.chrome | grep versionName
# Expected output should show 150.0.7871.47 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
