
Conceptual C++ patch and structural analysis for CVE-2026-85046, a critical type confusion zero-day vulnerability in Google Chrome's V8 engine
This repository contains the conceptual C++ patch for the critical zero-day vulnerability in Google Chrome's V8 JavaScript and WebAssembly engine (CVE-2026-85046).
The vulnerability is a high-severity type confusion bug in V8's Maglev and Turbofan compilers. It occurs when an array containing generic PACKED_ELEMENTS incorrectly receives a PACKED_SMI_ELEMENTS map, allowing attackers to read/write arbitrary pointers on the JavaScript heap.
v8_type_confusion_fix.cpp: The structural C++ logic demonstrating how map checks are enforced to prevent element confusion.ABOUT.md: Context on the vulnerability, its discovery, and the scope of the repository.README.md: Overview and instructions.End users should update Chrome Stable to version 152.0.7977.82/.83 (Windows/macOS) or 152.0.7977.82 (Linux) via Help > About Google Chrome.
This patch is provided for educational and research purposes for browser engine developers investigating the Turbofan/Maglev compilation pipeline.