CVE-2026-106239: Google Chrome WebGL RCE Vulnerability

CVE-2026-106239 Overview

CVE-2026-106239 is an integer overflow vulnerability in the WebGL component of Google Chrome on Android. The flaw affects Chrome versions prior to 155.0.8059.39 and is tracked under CWE-190: Integer Overflow or Wraparound. A remote attacker can serve a crafted HTML page that triggers the overflow during WebGL processing. Successful exploitation can lead to arbitrary code execution outside the Chrome sandbox. Google classifies the Chromium security severity as High, and the issue is tracked internally as Chromium Issue #546630009.

Critical Impact
Remote attackers can execute arbitrary code outside the Chrome sandbox on Android devices by luring users to a malicious web page.

Affected Products

Google Chrome for Android versions prior to 155.0.8059.39
Google Android devices running vulnerable Chrome builds
WebGL rendering component within Chromium

Discovery Timeline

2026-10-06 - CVE-2026-106239 published to the National Vulnerability Database
2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-106239

Vulnerability Analysis

The vulnerability resides in Chrome's WebGL implementation, which exposes GPU-accelerated 3D graphics APIs to JavaScript. WebGL processes untrusted inputs from web content, including vertex counts, buffer sizes, and texture dimensions. An integer overflow in this parsing path produces an undersized memory allocation or incorrect bounds calculation. Subsequent operations then read or write outside intended buffers. Because WebGL executes partly in the GPU process on Android, successful exploitation enables code execution outside the renderer sandbox.

The attack requires only that the victim load a crafted HTML page in a vulnerable Chrome build. No authentication is required, and user interaction is limited to visiting the attacker-controlled resource.

Root Cause

The root cause is an arithmetic operation on attacker-influenced size or index values that wraps past the maximum of its integer type. The wrapped value is then used in memory allocation or boundary checks, producing an inconsistency between allocated size and actual usage. This pattern is characteristic of CWE-190 issues in graphics code paths that handle large or crafted geometry data.

Attack Vector

Exploitation is network-based and delivered via web content. An attacker hosts a malicious page containing WebGL shader or buffer operations tuned to trigger the overflow. When a user on an unpatched Android Chrome build loads the page, the overflow corrupts memory in the GPU process. Chaining with additional primitives can achieve arbitrary code execution outside the sandbox. Technical details are tracked in the Chromium Issue Tracker and the Google Chrome Stable Update release notes.

Detection Methods for CVE-2026-106239

Indicators of Compromise

Unexpected crashes or restarts of the Chrome GPU process on Android devices with references to WebGL contexts.
Outbound connections from mobile endpoints to newly registered domains immediately following browser visits to untrusted sites.
Installation of unknown applications or persistence mechanisms following Chrome activity on affected devices.

Detection Strategies

Inventory mobile Chrome versions across the fleet and flag any instance below 155.0.8059.39.
Monitor web proxy and DNS telemetry for user navigation to known malicious infrastructure hosting WebGL exploit kits.
Correlate Chrome crash telemetry with subsequent process launches or network activity on the same device.

Monitoring Recommendations

Ingest mobile browser and Android system telemetry into a centralized data lake for cross-source correlation.
Alert on anomalous child processes or privileged operations originating from Chrome on Android.
Review MDM compliance reports to confirm continuous enforcement of browser patch baselines.

How to Mitigate CVE-2026-106239

Immediate Actions Required

Update Google Chrome for Android to version 155.0.8059.39 or later through the Google Play Store.
Enforce browser version compliance through mobile device management (MDM) policies.
Instruct users to avoid visiting untrusted links until patch deployment is verified.

Patch Information

Google addressed CVE-2026-106239 in Chrome 155.0.8059.39 for Android. Deployment details are published in the Google Chrome Stable Update advisory. Administrators should validate the installed version on managed Android devices after the Play Store rollout completes.

Workarounds

Restrict access to untrusted websites through enterprise web filtering until patching completes.
Disable WebGL where feasible through enterprise browser policies on managed devices.
Prioritize patching for high-risk user groups such as executives and privileged administrators.

bash

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

# Expected output after patching:
# versionName=155.0.8059.39