Preface: Type confusion is a vulnerability where a program accesses a resource using an incompatible type, leading to unexpected behavior or memory corruption. This often occurs when a program misinterprets the type of data being used, potentially leading to the execution of the wrong code or the disclosure of sensitive information. This can happen due to issues with type casting, memory layout mismatches, or speculative execution, and it’s a common foundation for various software attacks.

Background: V8 is Google’s open source high-performance JavaScript and Web Assembly engine, written in C++. It is used in Chrome and in Node.js, among others. V8 provides the core JavaScript execution environment that Node.js is built upon. It allows Node.js to: Execute JavaScript code outside the browser.

V8 is Google’s high-performance JavaScript engine used in Chrome and Node.js. It compiles JavaScript directly into machine code, optimizing execution through techniques like just-in-time (JIT) compilation. V8 uses multiple tiers of compilers (Ignition, Sparkplug, Maglev, Turbofan) and an efficient garbage collector to manage memory. Its design prioritizes speed and efficiency, making it a key component in modern web development.

Vulnerability details: CVE-2025-10585: Type Confusion in V8. Reported by Google Threat Analysis Group on 2025-09-16. Google has patched the issue, but details are restricted to prevent further exploitation until most users have updated.

Official announcement: Please refer to the link for details

https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop_17.html