CVE-2025-8576
📋 TL;DR
A use-after-free vulnerability in Google Chrome's extension system allows remote attackers to potentially exploit heap corruption via a malicious Chrome extension. This could lead to arbitrary code execution or browser crashes. All users running vulnerable Chrome versions are affected.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
📦 What is this software?
Chrome by Google
Google Chrome is the world's most popular web browser, used by over 3 billion users globally across Windows, macOS, Linux, Android, and iOS platforms. As a Chromium-based browser developed by Google, Chrome dominates the browser market with approximately 65% market share, making it a critical compon...
Learn more about Chrome →⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the Chrome process, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Browser crash (denial of service) or limited information disclosure through memory corruption.
If Mitigated
No impact if Chrome is updated to patched version or if malicious extensions are blocked.
🎯 Exploit Status
Exploitation requires user interaction to install or enable a malicious extension. The vulnerability is in the extension system itself.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 139.0.7258.66 and later
Vendor Advisory: https://chromereleases.googleblog.com/2025/08/stable-channel-update-for-desktop.html
Restart Required: Yes
Instructions:
Open Chrome
Click three-dot menu → Help → About Google Chrome
Chrome will automatically check for and install updates
Click 'Relaunch' to restart Chrome with the update
🔧 Temporary Workarounds
Disable Chrome Extensions
allTemporarily disable all extensions to prevent exploitation
chrome://extensions/ → Toggle off all extensions
Restrict Extension Installation
allConfigure Chrome policies to block extension installation
Windows: Configure via Group Policy (ExtensionInstallBlocklist)
macOS/Linux: Configure via policies.json
🧯 If You Can't Patch
- Use alternative browsers until Chrome can be updated
- Implement strict extension whitelisting policies
🔍 How to Verify
Check if Vulnerable:
Check Chrome version in About Google Chrome page. If version is below 139.0.7258.66, system is vulnerable.Check Version:
chrome://version/ or 'google-chrome --version' in terminalVerify Fix Applied:
Confirm Chrome version is 139.0.7258.66 or higher in About Google Chrome page.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports with extension-related stack traces
- Unexpected extension installation events
- Chrome process spawning unusual child processes
Network Indicators:
- Downloads of unknown Chrome extension files (.crx)
- Connections to suspicious extension repositories
SIEM Query:
source="chrome" AND (event="crash" OR event="extension_install") AND version<"139.0.7258.66"