CVE-2026-11641: Google Chrome Use-After-Free Vulnerability

CVE-2026-11641 Overview

CVE-2026-11641 is a use-after-free vulnerability [CWE-416] in the Bluetooth component of Google Chrome on Windows. The flaw affects Chrome versions prior to 149.0.7827.103. A remote attacker who convinces a user to perform specific UI gestures can execute arbitrary code through a crafted HTML page. Chromium rates the security severity as Critical, while the NVD CVSS 3.1 base score is 7.5. The vulnerability requires user interaction but no privileges or authentication, and it can be triggered over the network through a malicious web page.

Critical Impact

Successful exploitation enables arbitrary code execution within the Chrome renderer process, providing a foothold for sandbox escape chains and full host compromise on Windows endpoints.

Affected Products

• Google Chrome on Windows prior to 149.0.7827.103
• Microsoft Windows hosts running vulnerable Chrome builds
• Chromium-based browsers that inherit the affected Bluetooth code path

Discovery Timeline

• 2026-06-09 - CVE-2026-11641 published to NVD
• 2026-06-09 - Google releases fixed Chrome desktop build 149.0.7827.103
• 2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11641

Vulnerability Analysis

The vulnerability is a use-after-free condition [CWE-416] in Chrome's Bluetooth implementation. Use-after-free flaws occur when a program references memory after it has been deallocated. An attacker who controls the reclaimed allocation can place attacker-influenced data where freed object pointers or virtual function tables are expected. When the dangling reference is later dereferenced, control flow can be redirected to attacker-controlled code.

The attack complexity is rated High because successful exploitation depends on specific UI gestures performed by the victim. The Web Bluetooth API exposes device discovery and GATT communication to web origins, which broadens the renderer attack surface beyond standard DOM handling. Confidentiality, integrity, and availability are all rated High, consistent with arbitrary code execution in the renderer process.

Root Cause

The root cause is improper object lifetime management within the Bluetooth subsystem. A reference to a Bluetooth-related object persists after the object is freed, typically due to asynchronous callbacks, event handler races, or device disconnection paths that do not invalidate held pointers. See the Chromium Issue Tracker Entry for the upstream technical record.

Attack Vector

An attacker hosts a crafted HTML page that invokes the Web Bluetooth API. The victim must visit the page and complete specific UI gestures, such as a Bluetooth device chooser prompt. The page then triggers the freeing of an internal Bluetooth object while a stale reference is still reachable. Subsequent JavaScript-driven allocations groom the heap to place attacker-controlled data into the freed slot, enabling arbitrary code execution inside the renderer process.

No public exploit or proof-of-concept code is currently available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-11641

Indicators of Compromise

• Chrome renderer process crashes referencing Bluetooth modules in Windows Error Reporting (WER) dumps
• Outbound connections from Chrome to untrusted domains immediately following Bluetooth chooser interactions
• Unexpected child processes spawned by chrome.exe shortly after browsing sessions
• Endpoints running Chrome builds older than 149.0.7827.103 on Windows

Detection Strategies

• Inventory installed Chrome versions across the fleet and flag any build below 149.0.7827.103
• Hunt for renderer crash telemetry containing Bluetooth-related stack frames or device::BluetoothDevice references
• Correlate browser process anomalies with recent navigation events to low-reputation domains serving HTML that invokes navigator.bluetooth

Monitoring Recommendations

• Enable enterprise crash reporting for Chrome and forward dumps to a centralized analysis pipeline
• Monitor for anomalous post-exploitation behavior originating from chrome.exe, including suspicious child processes, LOLBin execution, and credential access attempts
• Track Web Bluetooth API usage policy violations through Chrome Enterprise reporting

How to Mitigate CVE-2026-11641

Immediate Actions Required

• Update Google Chrome on all Windows endpoints to version 149.0.7827.103 or later
• Force-restart Chrome after deployment to ensure the patched binary is loaded into memory
• Audit Chromium-based browsers and embedded WebViews for equivalent fixes from their respective vendors
• Restrict access to the Web Bluetooth API through enterprise policy where business use cases do not require it

Patch Information

Google resolved this vulnerability in the Chrome Stable channel update for desktop. Windows users must upgrade to Chrome 149.0.7827.103 or later. Refer to the Google Chrome Desktop Update advisory for release notes.

Workarounds

• Disable the Web Bluetooth API via the DefaultWebBluetoothGuardSetting enterprise policy until patching completes
• Block navigation to untrusted external sites through web filtering for users who cannot update immediately
• Educate users to dismiss unsolicited Bluetooth device chooser prompts on unfamiliar websites

# Configuration example: disable Web Bluetooth via Chrome Enterprise policy on Windows
# Registry path: HKLM\SOFTWARE\Policies\Google\Chrome
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v DefaultWebBluetoothGuardSetting /t REG_DWORD /d 2 /f

# Verify deployed Chrome version meets the patched baseline
powershell -Command "(Get-Item 'C:\Program Files\Google\Chrome\Application\chrome.exe').VersionInfo.ProductVersion"