CVE-2026-87527: Google Chrome WebGL Buffer Overflow Flaw

CVE-2026-87527 Overview

CVE-2026-87527 is a heap buffer overflow [CWE-122] in the WebGL component of Google Chrome. The flaw affects Chrome versions prior to 153.0.8010.36. A remote attacker can execute arbitrary code outside the browser sandbox by convincing a user to load a crafted HTML page. Google's Chromium security team rated the underlying issue as Critical severity. The vulnerability requires user interaction but no privileges, and the scope-changed impact allows the attacker to break sandbox isolation and reach the host operating system.

Critical Impact
Remote code execution outside the Chrome sandbox via a crafted web page, enabling full compromise of the browser process and potential lateral movement to the underlying host.

Affected Products

Google Chrome versions prior to 153.0.8010.36 on desktop platforms
Chromium-based browsers that share the vulnerable WebGL implementation
Any application embedding the affected Chromium WebGL rendering pipeline

Discovery Timeline

2026-09-09 - CVE-2026-87527 published to NVD
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2026-87527

Vulnerability Analysis

The vulnerability resides in Chrome's WebGL implementation, which exposes GPU-accelerated 3D graphics to JavaScript running in web pages. WebGL processes complex binary data structures, shaders, and vertex buffers supplied by untrusted origins. A crafted HTML page can trigger a heap buffer overflow inside the WebGL processing path, corrupting adjacent heap memory in the GPU or renderer process.

Because the flaw permits code execution outside the sandbox, an attacker can bypass the security boundary that normally contains renderer compromises. The scope-changed nature of the impact means a single visit to a malicious page can lead to full host compromise. The Chromium project tracks the underlying defect in Chromium Issue Tracker #548130125.

Root Cause

The root cause is a heap-based buffer overflow [CWE-122] in a WebGL code path. Insufficient bounds checking on attacker-controlled sizes during allocation or copy operations allows writes beyond the intended buffer. The corrupted heap metadata or adjacent objects then enable control-flow hijacking during subsequent memory operations.

Attack Vector

Exploitation proceeds through the network attack vector with low complexity. The attacker hosts a crafted HTML page containing malicious WebGL content and lures the victim to visit it via phishing, malvertising, or a compromised site. When the browser renders the page, the WebGL context processes the attacker's data and triggers the overflow. Successful exploitation yields arbitrary code execution outside the renderer sandbox with the privileges of the user running Chrome.

No verified proof-of-concept code is publicly available. See the Chrome Stable Channel Update for vendor details.

Detection Methods for CVE-2026-87527

Indicators of Compromise

Chrome renderer or GPU process crashes with heap corruption signatures preceding execution of unexpected child processes
Unusual child processes spawned by chrome.exe such as cmd.exe, powershell.exe, or shell binaries
Outbound network connections from Chrome processes to unfamiliar command-and-control infrastructure immediately after web browsing activity
Unexpected file writes to user profile directories or persistence locations shortly after page loads

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any host running a build older than 153.0.8010.36
Alert on Chrome process trees where the renderer or GPU process launches interpreters or LOLBins
Correlate browser crash telemetry with subsequent process creation and network events on the same host
Deploy web content inspection to identify pages hosting anomalous WebGL payloads targeting known vulnerable code paths

Monitoring Recommendations

Enable EDR telemetry on browser process trees, including cross-process handle access and memory allocation anomalies
Forward Chrome crash reports and Windows Error Reporting events to the SIEM for correlation
Monitor DNS and HTTP egress from browser processes for connections to newly registered or low-reputation domains
Track Chrome auto-update status per endpoint and alert on hosts where updates have stalled

How to Mitigate CVE-2026-87527

Immediate Actions Required

Update Google Chrome to version 153.0.8010.36 or later on all desktop endpoints without delay
Restart Chrome after the update to ensure the patched binaries are loaded into memory
Verify that Chrome's automatic update mechanism is enabled and functional across the fleet
Prioritize patching for users who browse arbitrary web content or handle sensitive data

Patch Information

Google released the fix in Chrome Stable Channel version 153.0.8010.36. Details are published in the Chrome Stable Channel Update. Administrators managing Chromium-based browsers should confirm that their vendor has incorporated the upstream fix from Chromium Issue Tracker #548130125.

Workarounds

Disable WebGL through enterprise policy by setting WebGLEnabled or equivalent group policy to false where the feature is not required
Restrict browsing to trusted destinations via web filtering while patching is in progress
Enforce site isolation and use application allowlisting to block unauthorized child processes spawned by Chrome
Consider temporarily routing high-risk users through a remote browser isolation solution until updates are deployed

bash

# Verify Chrome version on Windows
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463c-AFF1-A69D9E530F96}" /v pv

# Verify Chrome version on macOS
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString

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

# Disable WebGL via Chrome enterprise policy (Windows registry example)
reg add "HKLM\Software\Policies\Google\Chrome" /v WebGLEnabled /t REG_DWORD /d 0 /f