CVE-2026-4450: Google Chrome V8 RCE Vulnerability

CVE-2026-4450 Overview

CVE-2026-4450 is an out-of-bounds write vulnerability in the V8 JavaScript engine used by Google Chrome. This memory corruption flaw exists in Chrome versions prior to 146.0.7680.153 and can be exploited remotely by enticing a user to visit a malicious web page containing specially crafted HTML content. Successful exploitation allows attackers to corrupt heap memory, potentially leading to arbitrary code execution within the context of the browser process.

Critical Impact

Remote attackers can exploit heap corruption via crafted HTML pages, potentially achieving arbitrary code execution on victim systems running vulnerable Chrome versions.

Affected Products

• Google Chrome prior to version 146.0.7680.153
• Apple macOS (all versions running vulnerable Chrome)
• Linux (all distributions running vulnerable Chrome)
• Microsoft Windows (all versions running vulnerable Chrome)

Discovery Timeline

• 2026-03-20 - CVE-2026-4450 published to NVD
• 2026-03-20 - Last updated in NVD database

Technical Details for CVE-2026-4450

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-bounds Write), a memory corruption issue that occurs when the V8 JavaScript engine writes data beyond the boundaries of allocated memory buffers. The V8 engine is Chrome's high-performance JavaScript and WebAssembly execution environment, making it a critical attack surface for browser-based exploits.

The out-of-bounds write condition enables attackers to overwrite adjacent memory regions on the heap, corrupting object metadata, function pointers, or other sensitive data structures. This type of vulnerability is particularly dangerous in browser contexts because it can be triggered simply by visiting a malicious webpage—no additional user interaction beyond navigation is required.

Exploitation requires network access and user interaction (visiting the malicious page), but the attack complexity is low once the victim accesses attacker-controlled content. Complete compromise of confidentiality, integrity, and availability is possible through successful exploitation.

Root Cause

The root cause is an out-of-bounds write condition in Chrome's V8 JavaScript engine. The vulnerability stems from improper bounds checking during memory write operations, allowing data to be written outside the intended buffer boundaries. This occurs when V8 processes specially crafted JavaScript or WebAssembly code embedded in malicious HTML pages.

Attack Vector

The attack vector is network-based, requiring an attacker to host malicious content on a web server or inject it into compromised websites. The attack flow involves:

1. Attacker crafts a malicious HTML page containing JavaScript designed to trigger the out-of-bounds write condition in V8
2. Victim navigates to the malicious page through phishing, malvertising, or compromised legitimate sites
3. Chrome's V8 engine processes the malicious JavaScript
4. The out-of-bounds write corrupts heap memory structures
5. Attacker achieves arbitrary code execution in the renderer process context

The vulnerability affects all major operating systems where Google Chrome runs, including Windows, macOS, and Linux platforms. Since this targets the browser's rendering engine, successful exploitation could allow attackers to escape the browser sandbox in combination with other vulnerabilities or execute malicious code within the sandboxed renderer process.

Detection Methods for CVE-2026-4450

Indicators of Compromise

• Unusual Chrome renderer process crashes or instability when visiting specific websites
• Memory access violations or heap corruption errors in Chrome crash reports
• Suspicious JavaScript code attempting unusual TypedArray or ArrayBuffer manipulations
• Browser process spawning unexpected child processes after webpage visits

Detection Strategies

• Monitor endpoint detection platforms for Chrome renderer process anomalies and unexpected memory access patterns
• Deploy browser-based threat intelligence to block known malicious domains serving exploit code
• Implement network security monitoring to detect traffic patterns associated with exploit kit landing pages
• Enable Chrome's built-in crash reporting and analyze for V8-related heap corruption signatures

Monitoring Recommendations

• Configure SentinelOne agents to monitor Chrome process behavior for exploitation indicators
• Enable enhanced browser telemetry to capture V8 engine crashes and memory corruption events
• Monitor network traffic for connections to newly registered domains or known malicious infrastructure
• Review Chrome enterprise policies to ensure automatic updates are not blocked

How to Mitigate CVE-2026-4450

Immediate Actions Required

• Update Google Chrome to version 146.0.7680.153 or later immediately across all systems
• Enable automatic Chrome updates to ensure timely patch deployment
• Consider temporarily restricting access to untrusted websites until patches are deployed
• Review Chrome enterprise policies to verify automatic update functionality is enabled

Patch Information

Google has released Chrome version 146.0.7680.153 to address this vulnerability. The fix is available through the Google Chrome Stable Channel Update. Organizations should deploy this update immediately across all managed endpoints. Additional technical details may be available through the Chromium Issue Tracker.

Workarounds

• Implement strict site isolation via Chrome enterprise policies to limit renderer process compromise impact
• Enable Chrome's Enhanced Safe Browsing mode to increase protection against malicious websites
• Use network-level filtering to block access to known malicious domains and newly registered sites
• Consider deploying browser isolation solutions for high-risk users until patches can be applied

# Enable Chrome auto-updates via registry (Windows)
# Verify Chrome version is 146.0.7680.153 or later
# Check current version: chrome://settings/help

# For enterprise environments, use Group Policy to enforce updates
# HKLM\SOFTWARE\Policies\Google\Update
# Set "Update{8A69D345-D564-463C-AFF1-A69D9E530F96}" to 1 for auto-update