CVE-2026-2649: Google Chrome V8 RCE Vulnerability

CVE-2026-2649 Overview

CVE-2026-2649 is an integer overflow vulnerability in the V8 JavaScript engine used by Google Chrome prior to version 145.0.7632.109. This vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The vulnerability is classified with Chromium security severity as High and poses a significant risk to users who browse untrusted web content.

Critical Impact

Successful exploitation could allow attackers to execute arbitrary code in the context of the browser process, potentially leading to complete system compromise when combined with additional sandbox escape techniques.

Affected Products

• Google Chrome versions prior to 145.0.7632.109
• Chromium-based browsers using vulnerable V8 engine versions
• Desktop platforms running affected Chrome versions (Windows, macOS, Linux)

Discovery Timeline

• 2026-02-18 - CVE-2026-2649 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-2649

Vulnerability Analysis

This vulnerability exists within the V8 JavaScript engine, which is Chrome's high-performance JavaScript and WebAssembly engine. The integer overflow condition occurs during arithmetic operations, where the result exceeds the maximum value that can be stored in the integer type, causing the value to wrap around. In the context of V8, this can lead to incorrect memory allocation sizes or array bounds calculations.

When an integer overflow occurs during memory allocation size calculations, the allocated buffer may be significantly smaller than expected. Subsequent operations that write data to this undersized buffer based on the original (pre-overflow) size can corrupt adjacent heap memory, creating exploitable conditions.

Root Cause

The root cause is an integer overflow in V8's handling of certain JavaScript operations. When processing specifically crafted input, arithmetic operations produce results that exceed integer bounds, causing wrap-around behavior. This leads to incorrect size calculations that result in heap buffer overflows or underflows, which can be leveraged for arbitrary code execution.

The vulnerability is categorized under CWE-472 (External Control of Assumed-Immutable Web Parameter), though the primary exploitation mechanism involves classic integer overflow leading to heap corruption.

Attack Vector

The attack can be executed remotely via the network by convincing a user to visit a malicious webpage containing crafted HTML and JavaScript code. The attack requires user interaction (clicking a link or navigating to the attacker-controlled page), but requires no authentication or special privileges on the target system.

The exploitation flow involves:

1. Victim navigates to attacker-controlled webpage
2. Malicious JavaScript triggers the integer overflow in V8
3. Heap corruption occurs due to incorrect memory operations
4. Attacker achieves code execution within the renderer process sandbox
5. Additional exploits may be chained to escape the Chrome sandbox

Detailed technical analysis is available in the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-2649

Indicators of Compromise

• Unexpected Chrome renderer process crashes with heap corruption signatures
• Abnormal JavaScript execution patterns in browser logs
• Chrome crash reports indicating V8-related memory access violations
• Suspicious network connections initiated after visiting unknown websites

Detection Strategies

• Monitor for Chrome versions below 145.0.7632.109 in asset inventory systems
• Deploy endpoint detection rules for anomalous V8 process behavior
• Implement network-based detection for known exploit patterns in HTTP traffic
• Review browser crash telemetry for patterns consistent with heap corruption exploits

Monitoring Recommendations

• Enable Chrome crash reporting to centralized logging infrastructure
• Monitor for JavaScript-heavy pages triggering unusual memory allocation patterns
• Implement browser version compliance monitoring across endpoints
• Configure alerts for multiple Chrome renderer crashes from single users

How to Mitigate CVE-2026-2649

Immediate Actions Required

• Update Google Chrome to version 145.0.7632.109 or later immediately
• Enable automatic Chrome updates to ensure timely security patch deployment
• Consider temporarily restricting access to untrusted websites until patching is complete
• Deploy endpoint protection solutions capable of detecting exploit attempts

Patch Information

Google has addressed this vulnerability in Chrome version 145.0.7632.109. Users should update their browsers immediately. The update can be obtained through Chrome's built-in update mechanism or by downloading the latest version from the official Google Chrome website.

For detailed patch information, refer to the Chrome Releases Update Announcement.

Workarounds

• Disable JavaScript execution for untrusted sites using Chrome's content settings
• Use Chrome's Site Isolation feature to limit cross-origin data exposure
• Consider using a separate browser profile for high-risk browsing activities
• Implement network-level URL filtering to block known malicious domains

# Verify Chrome version from command line
google-chrome --version

# Force Chrome update check (Linux)
sudo apt update && sudo apt upgrade google-chrome-stable

# Enable enhanced protection in Chrome via policy
# Create/edit Chrome policy file
cat > /etc/opt/chrome/policies/managed/security_policy.json << EOF
{
  "SafeBrowsingProtectionLevel": 2,
  "SitePerProcess": true
}
EOF