CVE-2026-11651: Google Chrome Use After Free Vulnerability

CVE-2026-11651 Overview

CVE-2026-11651 is a use-after-free vulnerability in the Network component of Google Chrome prior to version 149.0.7827.103. A remote attacker can execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page to a victim. The flaw is tracked as CWE-416 and affects Chrome on Windows, macOS, and Linux. Google rates the Chromium security severity as High. Exploitation requires user interaction, typically loading an attacker-controlled web page. No public proof-of-concept and no in-the-wild exploitation have been reported at the time of publication.

Critical Impact
Remote attackers can achieve arbitrary code execution within the Chrome sandbox by luring users to a crafted HTML page, enabling potential further exploitation when chained with a sandbox escape.

Affected Products

Google Chrome versions prior to 149.0.7827.103
Chrome desktop builds on Microsoft Windows, Apple macOS, and Linux
Chromium-based browsers that incorporate the affected Network component code

Discovery Timeline

2026-06-09 - CVE-2026-11651 published to the National Vulnerability Database
2026-06-09 - Google releases fix in Chrome Stable Channel update 149.0.7827.103
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11651

Vulnerability Analysis

The vulnerability is a use-after-free condition in Chrome's Network component. Use-after-free flaws occur when code references memory after it has been freed, allowing an attacker who controls the freed allocation to influence program control flow. In Chrome's multi-process architecture, the Network service handles HTTP, HTTPS, and related protocol parsing. A crafted HTML page can trigger object lifetime mismanagement in this code path, causing dangling pointer dereference.

Successful exploitation yields arbitrary code execution within the Chrome sandbox. The sandbox limits direct system impact, but attackers commonly chain such bugs with a sandbox escape to achieve full remote code execution on the host. The attack scales to any user who visits the malicious page.

Root Cause

The root cause is improper object lifetime management within the Network component. An object is freed while another reference remains live, and a subsequent operation dereferences the stale pointer. Google has not published code-level details. Refer to the Chromium Issue Tracker entry for further technical context as Google releases it.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker hosts a crafted HTML page and induces the victim to visit it through phishing, malvertising, or a compromised site. The page triggers the vulnerable code path inside the renderer or network process, leading to memory corruption and arbitrary code execution inside the sandbox. No authentication is required.

No verified exploit code is publicly available. The vulnerability mechanism is described in prose per the Google Chrome Update Announcement.

Detection Methods for CVE-2026-11651

Indicators of Compromise

Unexpected Chrome renderer or network service process crashes correlated with browsing activity
Chrome child processes spawning command interpreters such as cmd.exe, powershell.exe, /bin/sh, or bash
Outbound connections from Chrome processes to uncategorized or newly registered domains immediately after page loads
Creation of executable files or scheduled tasks by Chrome processes outside the standard browser cache directories

Detection Strategies

Inventory Chrome installations across the fleet and flag any host running a version below 149.0.7827.103
Hunt for anomalous process trees where chrome.exe (or the platform equivalent) is the parent of shell or scripting binaries
Correlate browser crash telemetry with subsequent suspicious process or network behavior on the same host
Inspect web proxy logs for users who visited low-reputation domains shortly before endpoint anomalies

Monitoring Recommendations

Enable browser version reporting through enterprise management tools such as Chrome Browser Cloud Management
Forward endpoint process, file, and network telemetry to a SIEM or data lake for cross-source correlation
Alert on Chrome processes loading unsigned modules or making unexpected child-process invocations
Track Chrome Stable Channel release notes and integrate them into vulnerability management workflows

How to Mitigate CVE-2026-11651

Immediate Actions Required

Update Google Chrome to version 149.0.7827.103 or later on all Windows, macOS, and Linux endpoints
Force-restart Chrome after the update to ensure the patched binaries are loaded into memory
Audit Chromium-based browsers (Edge, Brave, Opera, Vivaldi) and apply vendor updates that incorporate the upstream fix
Prioritize patching for high-risk users such as executives, developers, and administrators

Patch Information

Google patched the issue in the Chrome Stable Channel release 149.0.7827.103. Full details are available in the Google Chrome Update Announcement. Administrators can deploy the update via standard Chrome auto-update, MSI installers, or platform package managers.

Workarounds

Restrict browsing to trusted sites using web proxy categorization or DNS filtering until patching is complete
Deploy Chrome enterprise policies that disable preview features and limit untrusted content where feasible
Enable site isolation and ensure the Chrome sandbox is not disabled by group policy or command-line flags
Use application allowlisting to prevent Chrome child processes from launching unauthorized executables

bash

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

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

# Verify on Windows (PowerShell)
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion

# Expected output: 149.0.7827.103 or later