CVE-2026-5874: Google Chrome Use-After-Free Vulnerability

CVE-2026-5874 Overview

CVE-2026-5874 is a use after free vulnerability in the PrivateAI component of Google Chrome prior to version 147.0.7727.55. This memory corruption flaw allows a remote attacker who convinces a user to engage in specific UI gestures to potentially perform a sandbox escape via a crafted HTML page. The Chromium security team has rated this vulnerability as Medium severity.

Critical Impact

Successful exploitation of this use after free vulnerability could allow attackers to escape the Chrome browser sandbox, potentially gaining elevated access to the underlying system through carefully crafted web content.

Affected Products

• Google Chrome versions prior to 147.0.7727.55
• Chromium-based browsers using vulnerable PrivateAI component
• Desktop platforms running affected Chrome versions

Discovery Timeline

• 2026-04-08 - CVE-2026-5874 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-5874

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to use a pointer after the memory it references has been freed. In the context of the PrivateAI component in Google Chrome, this flaw can be triggered through specific UI interactions, making it a user-assisted attack scenario.

The use after free condition in PrivateAI creates an opportunity for attackers to manipulate freed memory, potentially allowing arbitrary code execution within the renderer process. More critically, successful exploitation could lead to a sandbox escape, bypassing Chrome's security isolation mechanisms designed to contain malicious code within the browser environment.

Root Cause

The root cause of this vulnerability lies in improper memory management within the PrivateAI component of Google Chrome. When specific UI gestures are performed by the user, the component fails to properly track the lifecycle of memory objects, resulting in a dangling pointer that references previously freed memory. When this dangling pointer is subsequently dereferenced, attackers can exploit the condition to corrupt memory and potentially execute arbitrary code.

Attack Vector

Exploitation of CVE-2026-5874 requires user interaction. An attacker must convince a victim to visit a malicious webpage containing a crafted HTML payload and engage in specific UI gestures. The attack flow typically involves:

1. The attacker hosts a malicious HTML page designed to trigger the vulnerability
2. The victim is lured to visit the malicious page through social engineering
3. The victim performs specific UI interactions within the browser
4. The crafted page exploits the use after free condition in PrivateAI
5. Successful exploitation may allow the attacker to escape the browser sandbox

The vulnerability manifests within Chrome's PrivateAI component when handling certain UI interactions. For detailed technical information, refer to the Chromium Issue Tracker Entry once it becomes publicly accessible after the standard disclosure period.

Detection Methods for CVE-2026-5874

Indicators of Compromise

• Unexpected Chrome browser crashes or memory access violations related to PrivateAI component
• Suspicious HTML pages attempting to trigger specific UI gesture sequences
• Anomalous process behavior following Chrome renderer crashes suggesting sandbox escape attempts
• Evidence of memory corruption artifacts in Chrome crash dumps

Detection Strategies

• Monitor for Chrome crash reports indicating use after free conditions in the PrivateAI component
• Deploy browser version auditing to identify installations running vulnerable Chrome versions (prior to 147.0.7727.55)
• Implement web proxy inspection for potentially malicious HTML content targeting this vulnerability
• Leverage SentinelOne's behavioral AI to detect post-exploitation activities indicative of sandbox escapes

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and monitor for patterns related to PrivateAI
• Review endpoint telemetry for signs of browser-based exploitation attempts
• Monitor network traffic for connections to known malicious domains hosting exploit kits
• Configure security tooling to alert on suspicious child process creation from Chrome renderer processes

How to Mitigate CVE-2026-5874

Immediate Actions Required

• Update Google Chrome to version 147.0.7727.55 or later immediately
• Enable automatic Chrome updates to ensure timely security patches
• Educate users about the risks of clicking unknown links and interacting with untrusted web content
• Consider implementing browser isolation solutions for high-risk users

Patch Information

Google has released a security patch addressing this vulnerability in Chrome version 147.0.7727.55. Organizations should prioritize updating all Chrome installations to this version or later. For detailed release information, refer to the Google Chrome Update Blog.

The patch addresses the memory management issue in the PrivateAI component, ensuring proper object lifecycle handling to prevent the use after free condition.

Workarounds

• If immediate patching is not possible, consider restricting access to untrusted websites through web filtering
• Implement strict Content Security Policy headers on internal web applications
• Deploy network-level protection to block known malicious domains
• Consider temporarily disabling or restricting Chrome usage for high-value targets until patching is complete

# Verify Chrome version on Linux/macOS
google-chrome --version

# Force Chrome update check on Windows (run as administrator)
# Navigate to: chrome://settings/help to trigger automatic update

# Enterprise deployment: Use Chrome Enterprise policies
# to enforce minimum version requirements