Google has rolled out a critical update for its Chrome browser, addressing a high-severity vulnerability that could allow remote code execution.
The flaw, identified as CVE-2025-3066, targets Chrome’s Site Isolation feature, underscoring the importance of regular browser updates in protecting against cyber threats.
The update, released on April 8, 2025, brings Chrome’s Stable Channel to version 135.0.7049.84/.85 for Windows and Mac and 135.0.7049.84 for Linux.
CVE-2025-3066: Use-After-Free Vulnerability
The vulnerability at the core of this update, labeled CVE-2025-3066, is a “use-after-free” bug discovered in Chrome’s critical Site Isolation mechanism.
This feature is designed to safeguard user data by isolating web pages into separate processes, preventing cross-site data leakage.
However, the flaw creates openings for attackers to exploit freed memory and potentially execute arbitrary code on targeted systems.
Security researcher Sven Dysthe (@svn-dys) identified and reported the issue on March 21, 2025. In recognition of his contribution, Google rewarded him with $4,000 under its Vulnerability Reward Program (VRP).
Use-after-free vulnerabilities are particularly dangerous because of their potential to escalate into Remote Code Execution (RCE) attacks.
If exploited, such flaws could allow attackers to gain unauthorized control over affected systems, making them susceptible to data breaches or complete system compromise.
While Google has not confirmed active exploitation of CVE-2025-3066, users are urged to update their browsers promptly to prevent any exposure.
Security Updates and Protection Measures
The Chrome update also includes multiple fixes as part of Google’s ongoing internal audits, fuzzing processes, and advanced detection mechanisms such as AddressSanitizer, MemorySanitizer, and libFuzzer.
While detailed information about the vulnerability has been withheld to protect users during the phased rollout, Google has assured that the update significantly bolsters browser security.
Chrome users can verify if their browser is updated by navigating to Settings > About Chrome to check for the latest version. Those using older versions of Chrome should update immediately to prevent exploitation of the vulnerability.
As Google rolls out the patch, users are reminded of the critical role updates play in navigating evolving cybersecurity risks.
Though Google’s meticulous security efforts and collaboration with external researchers have been vital in identifying and resolving flaws, the discovery of CVE-2025-3066 serves as a reminder of the necessity of maintaining up-to-date software.
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