CVE-2026-5868: Google Chrome ANGLE RCE Vulnerability

CVE-2026-5868 Overview

A heap buffer overflow vulnerability has been identified in the ANGLE (Almost Native Graphics Layer Engine) component of Google Chrome on Mac systems. This vulnerability exists in versions prior to 147.0.7727.55 and can be exploited by a remote attacker to execute arbitrary code within the browser's sandbox through a specially crafted HTML page. The vulnerability has been classified as High severity by the Chromium security team.

Critical Impact

Remote attackers can achieve arbitrary code execution inside the Chrome sandbox by luring victims to visit a malicious webpage containing crafted content that triggers the heap buffer overflow in ANGLE's graphics processing layer.

Affected Products

• Google Chrome on Mac prior to version 147.0.7727.55
• Chromium-based browsers on Mac utilizing the affected ANGLE component
• Any application embedding vulnerable Chromium versions on macOS

Discovery Timeline

• 2026-04-08 - CVE-2026-5868 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-5868

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption flaw that occurs when data is written beyond the boundaries of a heap-allocated buffer. In the context of ANGLE, which serves as Chrome's cross-platform graphics abstraction layer translating OpenGL ES calls to native graphics APIs (Metal on macOS), the buffer overflow occurs during processing of graphics rendering commands.

The exploitation occurs within the browser's sandboxed environment, meaning successful exploitation grants code execution capabilities constrained by Chrome's sandbox boundaries. However, heap overflow vulnerabilities can potentially be chained with sandbox escape techniques for full system compromise.

Root Cause

The root cause of this vulnerability lies in improper bounds checking within ANGLE's memory management routines. When processing certain graphics operations via crafted HTML content, the ANGLE component fails to properly validate buffer sizes before writing data, allowing an attacker to overflow heap-allocated memory regions. This can corrupt adjacent heap metadata or objects, leading to controlled memory corruption scenarios.

Attack Vector

The attack vector for CVE-2026-5868 is network-based, requiring user interaction. An attacker must craft a malicious HTML page containing WebGL or other graphics content that triggers the vulnerable code path in ANGLE. When a victim visits the malicious page using an affected version of Chrome on Mac, the crafted content causes the heap buffer overflow, potentially enabling arbitrary code execution within the sandbox.

The attack chain typically involves:

1. Victim navigates to an attacker-controlled or compromised website
2. Malicious HTML/JavaScript initiates graphics operations targeting ANGLE
3. Crafted graphics commands trigger the heap overflow condition
4. Attacker gains code execution within Chrome's renderer sandbox

Detection Methods for CVE-2026-5868

Indicators of Compromise

• Unexpected Chrome renderer process crashes on macOS systems, particularly when visiting unfamiliar websites
• Memory corruption errors or abnormal memory allocation patterns in Chrome crash reports
• Suspicious WebGL or graphics-intensive content from untrusted sources
• Chrome stability issues specifically related to graphics rendering on Mac platforms

Detection Strategies

• Monitor for Chrome version strings below 147.0.7727.55 across macOS endpoints
• Implement browser crash telemetry analysis to identify potential exploitation attempts
• Deploy endpoint detection rules for anomalous renderer process behavior
• Review web proxy logs for access to known malicious domains serving exploit content

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and monitor for ANGLE-related crashes
• Configure SentinelOne to alert on suspicious Chrome process memory patterns
• Monitor macOS system logs for graphics subsystem anomalies correlated with Chrome activity
• Implement network monitoring for indicators of drive-by download campaigns

How to Mitigate CVE-2026-5868

Immediate Actions Required

• Update Google Chrome on all macOS systems to version 147.0.7727.55 or later immediately
• Enable automatic updates for Chrome to ensure rapid deployment of security patches
• Consider temporarily restricting access to untrusted websites on unpatched systems
• Review and audit all Chromium-based applications for similar version requirements

Patch Information

Google has addressed this vulnerability in Chrome version 147.0.7727.55. The fix is available through Chrome's standard update mechanism. Organizations should prioritize deployment of this update across all Mac endpoints. For detailed information about this security update, refer to the Google Chrome Update Announcement. Additional technical details can be found in the Chromium Issue Tracker Entry.

Workarounds

• Disable WebGL in Chrome settings (chrome://flags/#disable-webgl) as a temporary mitigation if immediate patching is not possible
• Implement web filtering to block access to high-risk or untrusted websites
• Consider using alternative browsers temporarily on critical systems while awaiting patch deployment
• Deploy application sandboxing solutions to provide additional isolation for Chrome processes

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

# Force Chrome update check via command line
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --check-for-update-interval=0