CVE-2026-3936: Google Chrome WebView Use-After-Free Flaw

CVE-2026-3936 Overview

CVE-2026-3936 is a Use After Free vulnerability affecting the WebView component in Google Chrome on Android prior to version 146.0.7680.71. This memory corruption vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The flaw falls under CWE-416 (Use After Free), a critical class of memory safety issues that can lead to arbitrary code execution.

Critical Impact

Remote attackers can exploit this heap corruption vulnerability to potentially execute arbitrary code or cause application crashes by enticing victims to visit a malicious webpage containing crafted HTML content.

Affected Products

• Google Chrome on Android prior to version 146.0.7680.71
• WebView component in affected Chrome versions
• Applications utilizing Chrome's WebView on vulnerable Android devices

Discovery Timeline

• 2026-03-11 - CVE CVE-2026-3936 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2026-3936

Vulnerability Analysis

This vulnerability is a Use After Free (UAF) condition in the WebView component of Google Chrome on Android. Use After Free vulnerabilities occur when a program continues to use a pointer to memory after it has been freed. In the context of Chrome's WebView, this vulnerability arises when the browser engine improperly handles memory during the rendering or processing of certain HTML content.

The network-accessible nature of this flaw means that exploitation requires no special privileges—only that a user interact with malicious content. An attacker can craft a specially designed HTML page that triggers the UAF condition when rendered by the vulnerable WebView component. Upon successful exploitation, the attacker may achieve heap corruption, which can be leveraged for arbitrary code execution within the browser's process context.

Root Cause

The root cause is improper memory management within Chrome's WebView implementation on Android. The vulnerability occurs when the WebView component deallocates a memory object but fails to properly invalidate or nullify the associated pointer. Subsequent operations that reference this dangling pointer lead to heap corruption when the freed memory is accessed or manipulated.

Attack Vector

The attack vector is network-based, requiring user interaction. An attacker would need to:

1. Create a malicious HTML page designed to trigger the Use After Free condition
2. Lure the victim to visit the crafted page via phishing, malvertising, or compromised websites
3. The malicious page triggers the UAF vulnerability during rendering in WebView
4. Successful exploitation results in heap corruption that can be chained with additional techniques for code execution

The vulnerability can be exploited remotely through any Android application that utilizes Chrome's WebView component to render untrusted HTML content.

Detection Methods for CVE-2026-3936

Indicators of Compromise

• Unexpected Chrome or WebView crashes with heap corruption signatures in crash logs
• Anomalous network traffic from Android applications using WebView to unknown or suspicious domains
• Memory access violations or segmentation faults logged during WebView rendering operations

Detection Strategies

• Monitor for Chrome or WebView process crashes with UAF-related error signatures on Android devices
• Implement web filtering solutions to block access to known malicious domains hosting exploit pages
• Deploy endpoint detection solutions capable of identifying anomalous memory operations in browser processes
• Review application logs for unexpected terminations of WebView-enabled applications

Monitoring Recommendations

• Enable enhanced logging for WebView components in enterprise-managed Android environments
• Monitor browser telemetry for rendering failures or crashes associated with external content
• Track Google Chrome version deployments across your Android device fleet to identify unpatched instances

How to Mitigate CVE-2026-3936

Immediate Actions Required

• Update Google Chrome on Android to version 146.0.7680.71 or later immediately
• Ensure automatic updates are enabled for Google Chrome on all Android devices
• Advise users to avoid clicking links from untrusted sources until the update is applied
• Consider restricting WebView usage in critical enterprise applications until patching is complete

Patch Information

Google has addressed this vulnerability in Chrome version 146.0.7680.71. Organizations should prioritize deploying this update across all Android devices. For additional details, refer to the Google Chrome Update Announcement and the Chromium Issue Tracker Entry.

Workarounds

• Implement network-level filtering to block access to suspicious or untrusted web content
• Disable WebView in non-essential applications where feasible pending patch deployment
• Educate users about phishing risks and avoiding clicks on unknown or suspicious links
• Consider using alternative browsers on Android devices until Chrome is updated

# Verify Chrome version on Android via ADB
adb shell dumpsys package com.android.chrome | grep versionName

# Expected output should show 146.0.7680.71 or higher for patched versions