CVE-2026-6316: Google Chrome Use After Free Vulnerability

CVE-2026-6316 Overview

CVE-2026-6316 is a use-after-free vulnerability in the Forms component of Google Chrome prior to version 147.0.7727.101. This memory corruption flaw allows a remote attacker to execute arbitrary code inside the browser sandbox by convincing a victim to visit a maliciously crafted HTML page. The vulnerability stems from improper memory management in Chrome's form handling code, where objects may be accessed after being freed.

Critical Impact

Remote code execution within the Chrome sandbox via malicious web page, potentially leading to further exploitation or sandbox escape when combined with other vulnerabilities.

Affected Products

• Google Chrome versions prior to 147.0.7727.101
• Chromium-based browsers using affected code versions
• Desktop platforms running vulnerable Chrome versions (Windows, macOS, Linux)

Discovery Timeline

• April 15, 2026 - CVE-2026-6316 published to NVD
• April 15, 2026 - Last updated in NVD database

Technical Details for CVE-2026-6316

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a common memory corruption issue in applications written in languages like C++ that do not have automatic memory management. In the context of Google Chrome's Forms component, this flaw occurs when the browser continues to reference and use a memory location after the associated object has been deallocated.

The exploitation requires user interaction—specifically, a victim must navigate to an attacker-controlled HTML page. Once the malicious page is loaded, the crafted content triggers the use-after-free condition in the Forms processing code, allowing the attacker to potentially control the freed memory region and execute arbitrary code within the browser's sandbox environment.

While the sandbox provides a layer of isolation, successful exploitation of this vulnerability could serve as a stepping stone for more sophisticated attacks, particularly when chained with sandbox escape vulnerabilities.

Root Cause

The root cause lies in improper lifecycle management of form-related objects within the Chrome rendering engine. When form elements are dynamically manipulated through JavaScript or during page rendering, certain code paths may prematurely free memory while other components retain dangling pointers to the freed region. Subsequent access through these stale references leads to the use-after-free condition.

This type of vulnerability is characteristic of complex C++ codebases where object ownership and lifetime management across multiple components can be difficult to track, especially during asynchronous operations common in web browser rendering.

Attack Vector

The attack is network-based and requires user interaction. An attacker must host or inject malicious HTML content that exploits the vulnerability in Chrome's Forms component. The attack chain typically involves:

1. Crafting an HTML page with specific form elements and JavaScript designed to trigger the memory corruption
2. Luring a victim to visit the malicious page through phishing, malvertising, or compromised websites
3. The malicious page triggers improper memory operations in the Forms component
4. The attacker gains code execution within the Chrome sandbox

For detailed technical information, refer to the Chromium Issue Tracker Entry once it becomes publicly accessible.

Detection Methods for CVE-2026-6316

Indicators of Compromise

• Unexpected Chrome crashes or memory access violations during form interactions
• Anomalous browser behavior when visiting web pages with complex form elements
• Chrome crash reports indicating memory corruption in Forms-related code paths
• Suspicious network traffic to unknown domains following browser instability

Detection Strategies

• Monitor endpoint detection systems for Chrome process anomalies including unexpected child process spawning
• Implement browser version auditing across the organization to identify unpatched instances
• Deploy network-based detection rules for known exploitation patterns targeting Chrome vulnerabilities
• Utilize SentinelOne's behavioral AI to detect memory corruption exploitation attempts in real-time

Monitoring Recommendations

• Enable Chrome crash reporting and analyze reports for Forms component failures
• Monitor for multiple Chrome restart events that may indicate exploitation attempts
• Implement web proxy logging to identify potential malicious page access patterns
• Track Chrome version deployment across endpoints using endpoint management tools

How to Mitigate CVE-2026-6316

Immediate Actions Required

• Update Google Chrome to version 147.0.7727.101 or later immediately across all endpoints
• Enable automatic Chrome updates to receive security patches promptly
• Consider implementing browser isolation technologies for high-risk users
• Review and restrict access to untrusted websites pending patch deployment

Patch Information

Google has addressed this vulnerability in Chrome version 147.0.7727.101. The fix resolves the improper memory handling in the Forms component that allowed the use-after-free condition. Organizations should prioritize deploying this update across all managed Chrome installations.

For official patch details, see the Google Chrome Update Announcement.

Workarounds

• Restrict user access to untrusted websites until patches can be applied
• Deploy web content filtering to block known malicious domains
• Consider using an alternative browser temporarily for high-risk activities if patching is delayed
• Enable Chrome's Site Isolation feature if not already active for additional process-level protection

# Verify Chrome version on endpoints
# Windows PowerShell
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe" | Select-Object -ExpandProperty "(default)"
& "$((Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe').'(default)')" --version

# Linux
google-chrome --version

# macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version