CVE-2026-5285: Google Chrome Use-After-Free Vulnerability

CVE-2026-5285 Overview

CVE-2026-5285 is a use-after-free vulnerability in the WebGL component of Google Chrome prior to version 146.0.7680.178. This memory corruption flaw allows remote attackers to execute arbitrary code within the browser sandbox by enticing a user to visit a specially crafted HTML page. WebGL, the JavaScript API for rendering interactive 2D and 3D graphics, processes complex graphics operations that, when improperly handled, can lead to dangerous memory states.

Critical Impact

Remote attackers can achieve arbitrary code execution inside Chrome's sandbox through a malicious webpage, potentially leading to further exploitation or sandbox escape when combined with additional vulnerabilities.

Affected Products

• Google Chrome versions prior to 146.0.7680.178
• Affects Chrome installations on Microsoft Windows
• Affects Chrome installations on Apple macOS
• Affects Chrome installations on Linux

Discovery Timeline

• April 1, 2026 - CVE-2026-5285 published to NVD
• April 2, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5285

Vulnerability Analysis

This use-after-free vulnerability (CWE-416) exists within Chrome's WebGL implementation, which handles GPU-accelerated graphics rendering in the browser. Use-after-free conditions occur when a program continues to reference memory after it has been freed, allowing attackers to manipulate the freed memory region and potentially gain control of program execution.

In this case, the WebGL component fails to properly manage object lifetimes during certain graphics operations. When specific sequences of WebGL API calls are made, the browser may free memory associated with a graphics object while still retaining a dangling reference to that memory. Subsequent operations that dereference this pointer can then read or write to memory that has been reallocated for other purposes.

The vulnerability requires user interaction—specifically, the victim must navigate to a malicious webpage containing the exploit code. Once triggered, attackers can execute arbitrary code within Chrome's sandbox environment. While sandbox isolation provides some mitigation, code execution within the renderer process remains a serious security concern, especially when chained with sandbox escape vulnerabilities.

Root Cause

The root cause stems from improper memory lifecycle management in Chrome's WebGL subsystem. The freed memory can be reclaimed and repurposed, but stale pointers within the WebGL context continue to reference the deallocated region. This creates an exploitable condition where attacker-controlled data can be placed in the freed memory location, allowing manipulation of program control flow or data structures.

Attack Vector

Exploitation occurs over the network when a victim visits an attacker-controlled or compromised website. The malicious page contains crafted JavaScript that invokes a specific sequence of WebGL API calls designed to trigger the use-after-free condition. No special privileges or authentication are required—only that the user be persuaded to visit the malicious page.

The vulnerability mechanism involves manipulating WebGL buffer objects or texture resources through carefully timed allocation and deallocation operations. By controlling the timing and content of these operations, an attacker can arrange for attacker-controlled data to occupy the freed memory region, enabling arbitrary code execution when the stale pointer is dereferenced.

For detailed technical information, see the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-5285

Indicators of Compromise

• Unusual WebGL-related crash reports or renderer process terminations
• Detection of known malicious HTML pages or JavaScript payloads targeting WebGL
• Unexpected network connections following browser crashes or instability
• Browser memory corruption signatures in crash dumps

Detection Strategies

• Monitor for Chrome renderer process crashes associated with WebGL operations
• Deploy web content filtering to block known exploit delivery domains
• Implement endpoint detection rules for anomalous browser process behavior
• Use SentinelOne's behavioral AI to detect post-exploitation activities following browser compromise

Monitoring Recommendations

• Enable Chrome crash reporting and analyze crash dumps for WebGL-related memory corruption patterns
• Monitor network traffic for connections to suspicious domains immediately following browser anomalies
• Track Chrome version deployment across the enterprise to identify unpatched installations
• Implement browser telemetry collection to identify unusual WebGL API usage patterns

How to Mitigate CVE-2026-5285

Immediate Actions Required

• Update Google Chrome to version 146.0.7680.178 or later immediately
• Enable automatic Chrome updates to ensure timely patching
• Consider temporarily disabling WebGL in high-security environments until patching is complete
• Educate users about the risks of visiting untrusted websites

Patch Information

Google has released Chrome version 146.0.7680.178 which addresses this vulnerability. Organizations should prioritize deploying this update across all managed endpoints. For detailed patch information, see the Google Chrome Update Announcement.

The update addresses the memory management issue in the WebGL component, ensuring proper object lifecycle handling to prevent the use-after-free condition.

Workarounds

• Disable WebGL in Chrome via chrome://flags/#disable-webgl as a temporary mitigation
• Use browser policies to restrict access to untrusted websites
• Deploy web filtering solutions to block known malicious content
• Consider using Chrome's Site Isolation features to limit renderer process impact

# Disable WebGL via Chrome enterprise policy (Windows Registry)
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v WebGLAllowed /t REG_DWORD /d 0 /f

# Verify Chrome version (command line)
google-chrome --version
# Should show: Google Chrome 146.0.7680.178 or higher