Google has issued an urgent security update to fix a zero-day vulnerability in its Chrome browser, which is currently under active exploitation in the wild.
The vulnerability, CVE-2025-6554, is classified as a type confusion flaw in Chrome’s V8 JavaScript and WebAssembly engine. According to the National Vulnerability Database (NVD):
“Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page.”
Type confusion vulnerabilities are severe security risks because they can:
Cause unexpected software behavior
Enable remote code execution
Lead to program crashes
Potentially allow attackers to bypass security protections
In zero-day scenarios, attackers exploit these flaws before a fix is available, making them extremely dangerous for unpatched systems.
The bug was discovered by Clément Lecigne from Google’s Threat Analysis Group (TAG) on June 25, 2025. Google’s TAG team specializes in detecting targeted attacks, often associated with nation-state actors or advanced cyber-espionage campaigns.
Given TAG’s involvement, this vulnerability could have been exploited in highly targeted attacks against individuals or organizations handling sensitive data.
Google responded quickly by:
Deploying a configuration-level fix the very next day
Rolling out a security update to the Chrome Stable channel across all platforms
While the threat might not be widespread yet, patching immediately is critical — especially for:
Government personnel
Corporate users
Security-sensitive environments
Windows: 138.0.7204.96 / .97
macOS: 138.0.7204.92 / .93
Linux: 138.0.7204.96
If you’re unsure whether you’ve updated:
Go to Settings > Help > About Google Chrome
The browser will automatically check for updates and install the latest version.
Enable automatic patch management
Monitor browser version compliance across your organization
Apply the patch to all Chromium-based browsers such as:
Microsoft Edge
Brave
Opera
Vivaldi
CVE-2025-6554 is the fourth Chrome zero-day vulnerability of the year, following:
CVE-2025-2783
CVE-2025-4664
CVE-2025-5419
While it’s unclear if all these vulnerabilities were exploited maliciously, CVE-2025-6554 is confirmed to be actively targeted.
Update Chrome immediately to the latest secure version
Enable automatic updates for all Chromium-based browsers
Educate your teams about potential phishing and drive-by download attacks
Stay informed by following trusted cybersecurity sources
Zero-day exploits are among the most dangerous cybersecurity threats, often used in targeted attacks against high-value organizations and individuals. Google’s quick response has mitigated this issue for now, but timely updates remain the best defense.
Stay vigilant and always keep your browsers and security tools up to date.
