CVE-2026-4454: Google Chrome Use After Free Vulnerability

CVE-2026-4454 Overview

CVE-2026-4454 is a use-after-free vulnerability in the Network component of Google Chrome prior to version 146.0.7680.153. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption via a specially crafted HTML page. The vulnerability has been classified with high severity by Chromium security.

Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it references has been freed. In the context of browser network operations, this can lead to arbitrary code execution, information disclosure, or browser crashes when an attacker tricks a user into visiting a malicious webpage.

Critical Impact

Remote attackers can exploit heap corruption through a crafted HTML page, potentially leading to arbitrary code execution in the context of the browser process. This could allow complete compromise of the affected system with user privileges.

Affected Products

• Google Chrome prior to version 146.0.7680.153
• Google Chrome on Microsoft Windows
• Google Chrome on Apple macOS
• Google Chrome on Linux

Discovery Timeline

• 2026-03-20 - CVE-2026-4454 published to NVD
• 2026-03-20 - Last updated in NVD database

Technical Details for CVE-2026-4454

Vulnerability Analysis

This vulnerability (CWE-416: Use After Free) affects the Network component of Google Chrome. The flaw exists in how Chrome handles network-related objects during page rendering. When memory associated with a network object is freed but subsequently accessed, it creates an exploitable condition that can lead to heap corruption.

The attack requires user interaction—specifically, the victim must navigate to or be redirected to a malicious webpage containing the crafted HTML payload. Once the vulnerable code path is triggered, an attacker can potentially achieve arbitrary code execution within the browser's sandboxed environment.

While Chrome employs multiple security mitigations including sandboxing and exploit mitigations like ASLR and CFI, use-after-free vulnerabilities in the Network component can still pose significant risks, particularly if chained with sandbox escape techniques.

Root Cause

The root cause stems from improper memory management in Chrome's Network component. Specifically, the vulnerability occurs when a network-related object is deallocated while a reference to that object still exists and is subsequently accessed. This creates a dangling pointer condition that can be exploited through carefully timed operations triggered by malicious HTML content.

The issue relates to the lifecycle management of network objects, where asynchronous operations or callback handling may reference memory that has already been freed during cleanup operations.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious HTML page designed to trigger the specific sequence of operations that causes the use-after-free condition. The attack scenario typically involves:

1. Attacker hosts or injects malicious HTML content on a web page
2. Victim navigates to the compromised page (via phishing, malvertising, or compromised legitimate sites)
3. The crafted HTML triggers network operations that exploit the memory management flaw
4. Heap corruption occurs, potentially allowing code execution

The vulnerability mechanism involves triggering specific network operations through crafted HTML that cause the browser to access freed memory. For detailed technical analysis, refer to Chromium Issue #488585488.

Detection Methods for CVE-2026-4454

Indicators of Compromise

• Unexpected Chrome browser crashes or hangs when visiting specific websites
• Memory corruption errors or heap-related crashes in Chrome crash reports
• Unusual network activity patterns from Chrome processes following page loads
• Suspicious HTML content containing complex network-triggering JavaScript

Detection Strategies

• Monitor for Chrome versions older than 146.0.7680.153 across the enterprise using software inventory tools
• Deploy endpoint detection rules to identify exploitation attempts targeting browser memory corruption
• Implement web filtering to block access to known malicious domains distributing exploit payloads
• Enable Chrome's built-in crash reporting and monitor for patterns indicating exploitation attempts

Monitoring Recommendations

• Configure centralized logging for browser crash events across endpoints
• Monitor network traffic for suspicious patterns associated with exploit delivery
• Implement browser version compliance monitoring to identify vulnerable installations
• Enable SentinelOne's behavioral AI to detect post-exploitation activities

How to Mitigate CVE-2026-4454

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 patching of future vulnerabilities
• Implement browser isolation solutions for high-risk users until patching is complete
• Review and restrict access to potentially malicious websites through web filtering

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 146.0.7680.153. The patch corrects the memory management issue in the Network component that allowed the use-after-free condition.

For complete patch details and release notes, see the Google Chrome Stable Update announcement.

Organizations should prioritize deployment of this update given the high severity rating and potential for remote code execution.

Workarounds

• Enable Chrome's Site Isolation feature if not already active to limit cross-origin impact
• Consider using browser policies to restrict JavaScript execution on untrusted sites
• Deploy network-level protections to filter known malicious content before it reaches endpoints
• Implement application whitelisting to prevent execution of unauthorized code

# Check current Chrome version and update status
# On Windows (PowerShell)
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.FileVersion

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

# On Linux
google-chrome --version

# Force Chrome update via enterprise policy (Windows Registry)
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v "AutoUpdateCheckPeriodMinutes" /t REG_DWORD /d 60 /f