CVE-2025-10585: Google Chrome V8 RCE Vulnerability

CVE-2025-10585 Overview

CVE-2025-10585 is a critical type confusion vulnerability in the V8 JavaScript engine used by Google Chrome. This flaw allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. Type confusion vulnerabilities occur when the engine incorrectly interprets an object as a different type, leading to memory corruption that can be leveraged for arbitrary code execution. This vulnerability affects Google Chrome versions prior to 140.0.7339.185 and is actively being exploited in the wild, prompting its addition to the CISA Known Exploited Vulnerabilities (KEV) catalog.

Critical Impact

This actively exploited vulnerability enables remote code execution through heap corruption, requiring no user authentication and exploitable via network with minimal complexity. Organizations should prioritize immediate patching.

Affected Products

• Google Chrome versions prior to 140.0.7339.185
• Apple macOS (running vulnerable Chrome versions)
• Linux (running vulnerable Chrome versions)
• Microsoft Windows (running vulnerable Chrome versions)

Discovery Timeline

• 2025-09-24 - CVE-2025-10585 published to NVD
• 2025-10-30 - Last updated in NVD database

Technical Details for CVE-2025-10585

Vulnerability Analysis

This vulnerability (CWE-843: Access of Resource Using Incompatible Type, commonly known as Type Confusion) exists within the V8 JavaScript engine, which is the core component responsible for executing JavaScript code in Google Chrome. The flaw occurs when V8 incorrectly handles type information during JavaScript execution, allowing an attacker to trick the engine into treating one type of object as another.

When exploited, this type confusion leads to heap corruption, creating a condition where memory can be manipulated in unintended ways. The vulnerability is particularly dangerous because it can be triggered remotely simply by visiting a malicious webpage containing specially crafted JavaScript code. No user interaction beyond navigating to the page is required.

The successful exploitation of this vulnerability can result in complete compromise of the affected system, allowing attackers to execute arbitrary code with the privileges of the Chrome browser process. This vulnerability has been confirmed as actively exploited in the wild, as indicated by its inclusion in the CISA Known Exploited Vulnerabilities Catalog.

Root Cause

The root cause of CVE-2025-10585 lies in improper type handling within the V8 JavaScript engine's type inference and optimization pipeline. During Just-In-Time (JIT) compilation, V8 makes assumptions about object types to optimize code execution. When these type assumptions are violated through carefully crafted JavaScript, the engine may access memory using incorrect type information, leading to out-of-bounds memory access and heap corruption.

Type confusion vulnerabilities in V8 typically arise in the TurboFan optimizing compiler or the object representation layer, where speculative optimizations based on observed types can be exploited if the attacker can manipulate the type system expectations.

Attack Vector

The attack vector for CVE-2025-10585 is network-based and requires no special privileges or user authentication. An attacker can exploit this vulnerability by:

1. Crafting a malicious HTML page containing JavaScript designed to trigger the type confusion condition in V8
2. Hosting the malicious page on a compromised or attacker-controlled website
3. Luring victims to visit the page through phishing, malvertising, or other social engineering techniques
4. The malicious JavaScript executes automatically when the page loads, corrupting heap memory
5. The attacker gains arbitrary code execution within the Chrome renderer process, potentially escaping the sandbox for full system compromise

The vulnerability is particularly concerning because it requires no user interaction beyond visiting the malicious page, and no authentication is needed, making it ideal for drive-by download attacks and watering hole campaigns.

Detection Methods for CVE-2025-10585

Indicators of Compromise

• Unusual Chrome process behavior, including unexpected crashes or high memory consumption
• Network connections to suspicious or newly registered domains serving JavaScript-heavy content
• Chrome renderer process attempting to execute unexpected system calls or access sensitive files
• Evidence of sandbox escape attempts following V8 exploitation patterns
• Anomalous JavaScript execution patterns in browser telemetry

Detection Strategies

• Monitor Chrome version across enterprise endpoints and flag systems running versions prior to 140.0.7339.185
• Deploy endpoint detection and response (EDR) solutions capable of detecting heap corruption exploitation techniques
• Implement network-based detection for known exploitation traffic patterns and malicious JavaScript payloads
• Enable Chrome's built-in crash reporting and monitor for V8-related crashes that may indicate exploitation attempts

Monitoring Recommendations

• Configure centralized logging for Chrome crash dumps and analyze for V8 type confusion signatures
• Monitor for unusual child process spawning from Chrome browser processes
• Track network connections initiated by Chrome to detect potential command-and-control communication post-exploitation
• Implement browser isolation solutions for high-risk users to contain potential exploitation

How to Mitigate CVE-2025-10585

Immediate Actions Required

• Update Google Chrome to version 140.0.7339.185 or later immediately across all systems
• Verify Chrome auto-update is enabled and functioning properly on all managed endpoints
• Prioritize systems with direct internet access and high-value users for immediate patching
• Consider temporarily restricting access to untrusted websites until patching is complete

Patch Information

Google has released Chrome version 140.0.7339.185 to address this vulnerability. The update is available through Chrome's automatic update mechanism and can be manually triggered by navigating to chrome://settings/help. Organizations should verify successful update deployment across their environment.

For detailed information about the security update, refer to the Google Chrome Update Announcement. Additional technical details may be available through the Chromium Issue Tracker Entry once the disclosure period has passed.

Workarounds

• Enable Site Isolation in Chrome to limit the impact of renderer compromises by navigating to chrome://flags/#enable-site-per-process
• Deploy browser isolation solutions to execute web content in isolated containers away from endpoint systems
• Consider using enterprise browser policies to restrict access to high-risk websites until patching is complete
• Implement application whitelisting to prevent unauthorized code execution even if exploitation occurs

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected output: Google Chrome 140.0.7339.185 or higher

# Force Chrome update check via command line (Linux)
google-chrome --check-for-update-interval=1

# Enterprise deployment: Use Group Policy or MDM to enforce minimum Chrome version
# Windows Registry key for minimum version enforcement:
# HKLM\SOFTWARE\Policies\Google\Chrome\MinimumChromeVersion = "140.0.7339.185"