CVE-2025-12428: Google Chrome V8 RCE Vulnerability

CVE-2025-12428 Overview

CVE-2025-12428 is a Type Confusion vulnerability in the V8 JavaScript engine used by Google Chrome versions prior to 142.0.7444.59. This vulnerability allows a remote attacker to perform arbitrary read/write operations through a specially crafted HTML page. Type Confusion vulnerabilities occur when code does not verify the type of an object it is operating on, leading to misinterpretation of data and potentially allowing an attacker to execute arbitrary code or access sensitive memory regions.

Critical Impact

Successful exploitation of this vulnerability could allow attackers to achieve arbitrary code execution in the context of the browser process, potentially leading to full system compromise when combined with sandbox escape techniques.

Affected Products

• Google Chrome prior to version 142.0.7444.59
• Google Chrome on Microsoft Windows
• Google Chrome on Apple macOS
• Google Chrome on Linux

Discovery Timeline

• 2025-11-10 - CVE-2025-12428 published to NVD
• 2025-11-13 - Last updated in NVD database

Technical Details for CVE-2025-12428

Vulnerability Analysis

This Type Confusion vulnerability resides in the V8 JavaScript engine, Chrome's high-performance engine responsible for parsing and executing JavaScript code. Type Confusion (CWE-843) occurs when the program allocates or initializes a resource such as a pointer, object, or variable using one type but later accesses that resource using a type that is incompatible with the original type.

In the context of V8, JavaScript's dynamic typing combined with just-in-time (JIT) compilation optimizations creates opportunities for type confusion attacks. V8 makes assumptions about object types for performance optimization. When these assumptions are violated through carefully crafted JavaScript, the engine may operate on data using incorrect type information, leading to memory corruption.

The vulnerability enables arbitrary read/write primitives, which are particularly dangerous as they provide attackers with the ability to read sensitive data from memory and modify critical data structures. This level of access is typically a stepping stone toward achieving full arbitrary code execution.

Root Cause

The root cause of CVE-2025-12428 lies in improper type validation within V8's code paths. When V8 encounters certain JavaScript object manipulations, it may fail to properly verify that an object conforms to the expected type before performing operations on it. This allows an attacker to craft JavaScript code that triggers the engine to treat one type of object as another, resulting in memory operations that use incorrect offsets or sizes based on the assumed type rather than the actual type.

Attack Vector

The attack vector for this vulnerability is network-based, requiring user interaction. An attacker must convince a victim to visit a malicious webpage or inject malicious content into a legitimate website. The exploitation scenario involves:

1. Attacker creates a malicious HTML page containing specially crafted JavaScript code
2. The JavaScript exploits V8's type confusion by manipulating object types in a way that causes the engine to misinterpret data
3. Through careful manipulation, the attacker achieves arbitrary read/write capabilities
4. These primitives can be leveraged to overwrite function pointers or other critical data structures
5. Ultimately, the attacker gains control of execution flow within the renderer process

The vulnerability is classified as requiring user interaction (clicking a link, visiting a site), but no special privileges are required beyond normal web browsing. For detailed technical information, refer to the Chromium Issue Tracker Entry.

Detection Methods for CVE-2025-12428

Indicators of Compromise

• Abnormal memory access patterns originating from Chrome renderer processes
• Unusual JavaScript execution behavior or crashes in the V8 engine
• Browser process attempting to spawn unexpected child processes
• Memory corruption indicators in Chrome crash dumps

Detection Strategies

• Monitor for Chrome versions below 142.0.7444.59 across all endpoints using asset management tools
• Implement browser version enforcement policies to detect and alert on outdated installations
• Deploy endpoint detection solutions capable of identifying exploitation attempts targeting browser vulnerabilities
• Enable Chrome's built-in crash reporting and monitor for V8-related crashes

Monitoring Recommendations

• Configure SIEM rules to alert on multiple browser crashes from the same endpoint within a short timeframe
• Monitor network traffic for connections to known malicious domains that may host exploit pages
• Implement browser isolation solutions for accessing untrusted websites
• Enable enhanced telemetry for browser processes to capture memory anomalies

How to Mitigate CVE-2025-12428

Immediate Actions Required

• Update Google Chrome to version 142.0.7444.59 or later immediately across all systems
• Enable automatic updates for Chrome to ensure timely patching of future vulnerabilities
• Audit enterprise environments for instances of Chrome below the patched version
• Consider blocking access to untrusted websites until patches are deployed

Patch Information

Google has released Chrome version 142.0.7444.59 which addresses this vulnerability. The update is available through Chrome's built-in update mechanism and from the official download page. Organizations using enterprise deployment should push updates through their software distribution systems immediately.

For full details, see the Chrome Stable Channel Update announcement from Google.

Workarounds

• Implement strict site isolation features in Chrome via enterprise policies
• Consider using browser isolation solutions for high-risk browsing activities
• Disable JavaScript on untrusted sites using extensions or enterprise policies (note: may impact functionality)
• Limit browser usage to essential sites only until patches can be applied

# Verify Chrome version on Linux/macOS
google-chrome --version

# Force Chrome update check
# Navigate to chrome://settings/help in the browser

# Enterprise policy to enforce minimum version (Windows Registry)
# HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome
# Value: MinimumChromeVersion = "142.0.7444.59"