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. A remote attacker can exploit this flaw by serving a crafted HTML page to a victim, triggering arbitrary code execution within the Chrome sandbox. The issue is tracked under CWE-416 and affects Chrome installations across Windows, macOS, and Linux. Google rates the Chromium security severity as High. Exploitation requires user interaction, specifically that the victim navigates to attacker-controlled content. Successful exploitation impacts confidentiality, integrity, and availability of the browser process.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome sandbox by luring users to a malicious web page rendered through the WebGL pipeline.

Affected Products

Google Chrome versions prior to 146.0.7680.178
Chrome installations on Microsoft Windows, Apple macOS, and Linux
Chromium-based browsers incorporating the affected WebGL code

Discovery Timeline

2026-04-01 - CVE-2026-5285 published to the National Vulnerability Database (NVD)
2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-5285

Vulnerability Analysis

The flaw is a use-after-free condition [CWE-416] in the WebGL implementation within Chrome's renderer process. WebGL exposes the GPU pipeline to JavaScript, parsing complex graphics state and managing GPU resource lifetimes. When an object is freed while a dangling reference remains reachable, subsequent operations on that reference can be coerced into memory corruption primitives. Attackers can leverage such primitives to hijack control flow inside the renderer. Although the renderer runs inside Chrome's sandbox, code execution at that boundary is a common precursor to chained sandbox-escape exploits. The advisory confirms the impact reaches arbitrary code execution within the sandbox.

Root Cause

The root cause is improper object lifetime management inside the WebGL subsystem. Specifically, a referenced GPU or context object is deallocated while JavaScript code retains an active handle, leaving a stale pointer in renderer memory. The Chromium issue tracker entry Chromium Issue #492228019 documents the fix details.

Attack Vector

Exploitation requires a victim to load a crafted HTML page containing malicious WebGL calls. No authentication is required, and the attack proceeds entirely over the network. User interaction is limited to visiting attacker-controlled content, which is readily achievable through phishing, malvertising, or compromised sites. Once triggered, the use-after-free yields code execution in the renderer, where attackers typically stage further exploits against IPC interfaces to escape the sandbox.

No public proof-of-concept code has been published for CVE-2026-5285. Technical details are documented in the Chromium Issue Tracker, which may remain restricted until broader patch adoption.

Detection Methods for CVE-2026-5285

Indicators of Compromise

Chrome renderer process crashes or unexpected child-process terminations correlated with WebGL-heavy pages
Outbound connections to recently registered domains immediately following Chrome browsing activity
Browser-spawned child processes executing shell utilities, scripting engines, or LOLBins

Detection Strategies

Inventory Chrome installations and flag any build older than 146.0.7680.178 as vulnerable
Monitor endpoint telemetry for anomalous process trees originating from chrome.exe renderer processes
Inspect web proxy logs for traffic to known exploit kit or malvertising infrastructure delivering WebGL payloads

Monitoring Recommendations

Centralize Chrome version telemetry through endpoint management or SIEM ingestion for continuous patch validation
Alert on renderer crash dumps tagged with WebGL or GPU process modules
Correlate browser exploitation indicators with downstream credential access and persistence behaviors

How to Mitigate CVE-2026-5285

Immediate Actions Required

Update Google Chrome to version 146.0.7680.178 or later on all Windows, macOS, and Linux endpoints
Force-restart Chrome after deployment to ensure the patched binary is loaded into memory
Audit managed Chromium-based browsers (Edge, Brave, Opera, Vivaldi) and apply vendor updates incorporating the upstream Chromium fix

Patch Information

Google addressed CVE-2026-5285 in the Chrome Stable channel release announced in the Google Chrome Stable Update. Administrators should deploy 146.0.7680.178 or later through enterprise update mechanisms such as Group Policy, Jamf, or Linux package management. Verify the running version via chrome://settings/help after deployment.

Workarounds

Disable WebGL via enterprise policy by setting the WebGLEnabled policy to false until patches are deployed
Restrict access to untrusted web content through web filtering or browser isolation for high-risk users
Enforce Chrome auto-update policies to reduce patch latency across the fleet

bash

# Configuration example: disable WebGL via Chrome enterprise policy on Linux
sudo tee /etc/opt/chrome/policies/managed/disable_webgl.json > /dev/null <<'EOF'
{
  "WebGLEnabled": false
}
EOF

# Verify deployed Chrome version meets the patched baseline
google-chrome --version