CVE-2026-5870: Google Chrome Skia RCE Vulnerability

CVE-2026-5870 Overview

An integer overflow vulnerability has been identified in the Skia graphics library component of Google Chrome prior to version 147.0.7727.55. This vulnerability allows a remote attacker to potentially execute arbitrary code within the browser sandbox by enticing a victim to visit a specially crafted HTML page. The vulnerability has been assigned a "High" severity rating by Chromium security.

Critical Impact

Remote code execution within the Chrome sandbox via malicious web content, requiring only user interaction (visiting a crafted webpage).

Affected Products

• Google Chrome prior to version 147.0.7727.55
• Chromium-based browsers using vulnerable Skia versions
• Desktop platforms (Windows, macOS, Linux)

Discovery Timeline

• 2026-04-08 - CVE-2026-5870 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-5870

Vulnerability Analysis

This vulnerability is classified as an integer overflow (CWE-472) within Google Chrome's Skia graphics library. Skia is the 2D graphics engine used by Chrome to render web content, handling operations such as drawing shapes, text, and images. Integer overflows occur when arithmetic operations produce values that exceed the maximum representable value for the data type, causing the value to wrap around unexpectedly.

In this case, the integer overflow in Skia can lead to incorrect memory allocation sizes or buffer boundary calculations. When processing specially crafted graphical content embedded in an HTML page, the overflow condition can corrupt memory structures, ultimately enabling an attacker to execute arbitrary code within the browser's sandboxed renderer process.

Root Cause

The root cause stems from insufficient validation of integer arithmetic operations within the Skia graphics processing pipeline. When handling certain graphical operations or rendering parameters, the affected code performs calculations without proper overflow checks. This allows an attacker to supply input values that, when combined arithmetically, exceed the bounds of the integer data type. The resulting wrapped value leads to undersized buffer allocations or incorrect loop bounds, creating exploitable memory corruption conditions.

Attack Vector

The attack vector for CVE-2026-5870 is network-based, requiring a victim to navigate to a malicious webpage. The exploitation process typically follows this pattern:

1. An attacker creates a malicious HTML page containing crafted graphical content designed to trigger the integer overflow condition in Skia
2. The victim is lured to visit the malicious page through phishing, malvertising, or compromised legitimate websites
3. Chrome's Skia graphics engine processes the malicious content, triggering the integer overflow
4. The overflow corrupts memory structures within the renderer process
5. The attacker achieves code execution within the Chrome sandbox

While successful exploitation results in code execution within Chrome's sandbox, this represents a significant security boundary breach. Sandbox escapes, combined with this vulnerability, could potentially lead to full system compromise.

The vulnerability mechanism involves crafted graphical parameters that cause integer overflow during rendering calculations. For complete technical details, refer to the Chromium Issue Tracker Entry once the security embargo is lifted.

Detection Methods for CVE-2026-5870

Indicators of Compromise

• Unusual Chrome renderer process crashes or memory access violations during normal browsing
• Chrome crash reports indicating Skia-related stack traces
• Unexpected memory consumption patterns in Chrome renderer processes
• Network traffic to newly registered or suspicious domains serving graphical content

Detection Strategies

• Monitor endpoint detection logs for anomalous behavior in Chrome renderer processes
• Deploy browser-level policies to alert on repeated renderer crashes
• Implement network monitoring for connections to known malicious infrastructure
• Utilize memory protection technologies to detect exploitation attempts

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and monitor for Skia-related crashes at scale
• Implement endpoint detection and response (EDR) solutions to monitor Chrome process behavior
• Review web proxy logs for access to suspicious sites serving crafted HTML content
• Monitor for lateral movement or persistence mechanisms following potential browser compromise

How to Mitigate CVE-2026-5870

Immediate Actions Required

• Update Google Chrome to version 147.0.7727.55 or later immediately
• Enable automatic Chrome updates to ensure timely patch deployment
• Consider temporarily using alternative browsers if immediate patching is not possible
• Educate users about the risks of visiting untrusted websites

Patch Information

Google has addressed this vulnerability in Chrome version 147.0.7727.55. Organizations should deploy this update across all managed endpoints as a priority. The official Chrome release announcement is available at the Google Chrome Update Announcement.

For enterprise environments, administrators can use Google's enterprise deployment tools or third-party patch management solutions to ensure consistent deployment across the organization.

Workarounds

• Restrict access to untrusted websites through web filtering policies
• Consider enabling Chrome's Site Isolation feature for additional process-level protection
• Deploy Content Security Policy headers on internal web applications to limit embedded content
• Use browser sandboxing solutions for high-risk browsing activities

# Chrome Enterprise policy configuration for automatic updates
# Windows Registry Configuration
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v "AutoUpdateCheckPeriodMinutes" /t REG_DWORD /d 60 /f
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v "UpdateDefault" /t REG_DWORD /d 1 /f

# Verify Chrome version on endpoints
"C:\Program Files\Google\Chrome\Application\chrome.exe" --version