CVE-2026-6298: Google Chrome Skia Buffer Overflow Flaw

CVE-2026-6298 Overview

A heap buffer overflow vulnerability exists in the Skia graphics library used by Google Chrome versions prior to 147.0.7727.101. This memory corruption flaw allows a remote attacker to obtain potentially sensitive information from process memory by tricking a victim into visiting a specially crafted HTML page. The vulnerability was assigned a Chromium security severity rating of Critical by Google's security team.

Critical Impact

Remote attackers can exploit this heap buffer overflow to read sensitive information from Chrome's process memory, potentially exposing credentials, session tokens, or other confidential data processed by the browser.

Affected Products

• Google Chrome versions prior to 147.0.7727.101
• Chromium-based browsers utilizing the vulnerable Skia graphics library
• All platforms running affected Chrome versions (Windows, macOS, Linux)

Discovery Timeline

• 2026-04-15 - CVE-2026-6298 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-6298

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption issue that occurs when data is written to a heap-allocated buffer beyond its allocated boundaries. In the context of Skia, Google Chrome's 2D graphics library responsible for rendering virtually all graphics including text, shapes, and images, this flaw can be triggered during the processing of malicious HTML content.

The heap buffer overflow in Skia occurs when the graphics engine processes specially crafted rendering instructions embedded within a malicious HTML page. When Chrome attempts to render the malicious content, the overflow condition allows an attacker to read beyond the intended memory boundaries, potentially accessing sensitive information stored in adjacent heap memory regions.

This type of out-of-bounds read vulnerability is particularly concerning in browser environments where process memory may contain authentication tokens, form data, cryptographic keys, or other sensitive user information that could be exfiltrated to an attacker-controlled server.

Root Cause

The root cause lies in improper bounds checking within Skia's heap memory allocation and access routines. When processing certain graphics rendering operations, the library fails to properly validate buffer boundaries before performing read operations, allowing access to unintended memory locations. This insufficient input validation in the graphics rendering pipeline creates the conditions for exploitation when handling malformed graphical data structures.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious HTML page containing specially designed graphics elements or rendering instructions that trigger the vulnerable code path in Skia. The attack scenario typically involves:

1. Attacker creates a webpage with malicious HTML/CSS/SVG content targeting the Skia vulnerability
2. Victim is lured to visit the attacker-controlled page via phishing, malvertising, or compromised legitimate websites
3. Chrome's Skia library processes the malicious content, triggering the heap buffer overflow
4. Sensitive data from Chrome's process memory is read and can be exfiltrated back to the attacker

The vulnerability does not require any special privileges and can be exploited against any user with a vulnerable Chrome installation simply by visiting a malicious webpage.

Detection Methods for CVE-2026-6298

Indicators of Compromise

• Unusual network traffic from Chrome processes to unknown external hosts following visits to suspicious websites
• Chrome crash reports or stability issues when rendering specific web content
• Memory access violations or heap corruption errors in Chrome's crash logs referencing Skia components
• Unexpected data exfiltration patterns originating from browser processes

Detection Strategies

• Monitor Chrome version deployments across endpoints to identify systems running versions prior to 147.0.7727.101
• Implement network monitoring for suspicious outbound connections following browser rendering operations
• Deploy endpoint detection rules to identify memory access anomalies in Chrome's graphics rendering processes
• Utilize browser extension or web proxy policies to block access to known malicious domains distributing exploit code

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and monitor for Skia-related crashes
• Implement centralized logging for Chrome update status across the enterprise environment
• Monitor for indicators of heap spray or memory disclosure techniques in browser process telemetry
• Establish baseline Chrome behavior profiles to detect anomalous memory access patterns

How to Mitigate CVE-2026-6298

Immediate Actions Required

• Update Google Chrome to version 147.0.7727.101 or later immediately on all systems
• Enable automatic Chrome updates to ensure timely deployment of security patches
• Educate users about the risks of visiting untrusted websites until patching is complete
• Consider temporary use of alternative browsers if immediate patching is not possible

Patch Information

Google has released Chrome version 147.0.7727.101 which addresses this heap buffer overflow vulnerability in Skia. Organizations should prioritize updating all Chrome installations to this version or later. Detailed information about this update is available in the Google Chrome Update Announcement. The technical details of the vulnerability fix can be tracked via the Chromium Issue Tracker Entry.

Workarounds

• Implement web content filtering to block access to untrusted or suspicious websites until patches can be deployed
• Consider deploying browser isolation solutions that render web content in sandboxed environments
• Restrict Chrome's auto-update blocking policies if previously configured to allow immediate security updates
• Enable Chrome's Site Isolation feature if not already active to provide additional memory protection boundaries

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

# Force Chrome update check (run Chrome with update flag)
# Windows: "C:\Program Files\Google\Chrome\Application\chrome.exe" --check-for-update-interval=1

# Verify Enterprise Chrome deployment version via registry (Windows)
# reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version