CVE-2026-4678: Google Chrome Use After Free Vulnerability

CVE-2026-4678 Overview

A use-after-free vulnerability exists in the WebGPU component of Google Chrome prior to version 146.0.7680.165. This memory corruption flaw allows a remote attacker to potentially execute arbitrary code within the browser's sandbox by convincing a user to visit a specially crafted HTML page. The vulnerability stems from improper memory management in the WebGPU implementation, where freed memory can be accessed after deallocation.

Critical Impact
Remote attackers can exploit this use-after-free vulnerability to execute arbitrary code within Chrome's sandbox, potentially compromising user confidentiality, integrity, and availability through malicious web content.

Affected Products

Google Chrome prior to version 146.0.7680.165
Google Chrome on Microsoft Windows
Google Chrome on Apple macOS
Google Chrome on Linux

Discovery Timeline

2026-03-24 - CVE-2026-4678 published to NVD
2026-03-24 - Last updated in NVD database

Technical Details for CVE-2026-4678

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption issue that occurs when a program continues to use a pointer after the memory it references has been freed. In the context of the WebGPU component, the vulnerability arises during the handling of GPU resources within the browser's rendering pipeline.

WebGPU is a modern graphics API exposed to web applications for high-performance graphics and compute operations. The use-after-free condition in this implementation allows attackers to manipulate memory state through carefully crafted HTML content. When the freed memory is subsequently reallocated and populated with attacker-controlled data, dereferencing the dangling pointer can lead to arbitrary code execution.

The attack requires user interaction—specifically, a victim must navigate to a malicious webpage containing the exploit code. While code execution is constrained within Chrome's sandbox, successful exploitation could still lead to information disclosure or serve as a stepping stone for sandbox escape chains.

Root Cause

The root cause of CVE-2026-4678 is improper lifetime management of WebGPU objects within the Chrome rendering engine. When GPU resources are freed, references to those objects are not properly invalidated, creating dangling pointers. Subsequent operations that attempt to access these freed resources trigger the use-after-free condition, allowing attackers to corrupt memory and hijack control flow.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must host or inject malicious HTML and JavaScript content that exploits the WebGPU vulnerability. When a victim visits the compromised page, the exploit triggers the use-after-free condition through specific sequences of WebGPU API calls.

The attack flow typically involves:

Creating WebGPU resources (buffers, textures, or pipeline objects)
Triggering a code path that frees the resource prematurely
Reallocating the freed memory with attacker-controlled data
Accessing the dangling pointer to achieve code execution

Due to the technical complexity of exploiting use-after-free vulnerabilities in modern browsers with mitigations like ASLR and Control Flow Integrity, successful exploitation requires sophisticated heap manipulation techniques.

Detection Methods for CVE-2026-4678

Indicators of Compromise

Unusual Chrome crashes or instability when visiting specific websites
Abnormal GPU process memory consumption patterns
Chrome renderer process attempting unexpected network connections
Evidence of heap spray patterns in crash dumps

Detection Strategies

Monitor for WebGPU API abuse patterns in browser telemetry
Implement network traffic analysis to identify pages hosting exploit code
Deploy endpoint detection to identify anomalous Chrome process behavior
Review browser crash reports for use-after-free signatures in the WebGPU component

Monitoring Recommendations

Enable Chrome's extended stable channel for delayed rollout with additional testing
Monitor security advisories from the Chrome Releases Blog
Track the Chromium Issue Tracker for updates on this vulnerability
Implement browser version monitoring across enterprise endpoints

How to Mitigate CVE-2026-4678

Immediate Actions Required

Update Google Chrome to version 146.0.7680.165 or later immediately
Enable automatic updates for Chrome across all managed endpoints
Verify Chrome version compliance across the organization using endpoint management tools
Consider temporarily disabling WebGPU via Chrome flags if immediate patching is not possible

Patch Information

Google has released a security patch addressing this vulnerability in Chrome version 146.0.7680.165. The fix properly manages WebGPU object lifetimes to prevent dangling pointer access. Organizations should reference the official Google Chrome Stable Channel Update for complete patch details.

The update applies to Chrome installations on Windows, macOS, and Linux platforms. Enterprise administrators can deploy the update through Chrome Browser Cloud Management or their preferred software distribution system.

Workarounds

Disable WebGPU via Chrome flags by navigating to chrome://flags/#enable-unsafe-webgpu and setting to Disabled
Implement content filtering to block access to untrusted websites until patching is complete
Use browser isolation solutions to contain potential exploitation attempts
Consider deploying Chrome Enterprise policies to restrict WebGPU access in high-security environments

bash

# Configuration example - Disable WebGPU via Chrome command line
# Add this flag when launching Chrome to disable WebGPU functionality
google-chrome --disable-features=WebGPU

# For enterprise deployment via Chrome policy (Linux/macOS)
# Create or edit the managed preferences file
mkdir -p /etc/opt/chrome/policies/managed/
echo '{"WebGPUEnabled": false}' > /etc/opt/chrome/policies/managed/webgpu_policy.json