CVE-2026-11649: Google Chrome Use After Free Vulnerability

CVE-2026-11649 Overview

CVE-2026-11649 is a use-after-free vulnerability in the V8 JavaScript engine of Google Chrome prior to version 149.0.7827.103. A remote attacker can exploit this flaw by serving a crafted HTML page to a target browser. Successful exploitation allows arbitrary code execution within the Chrome sandbox. The vulnerability is tracked under [CWE-416] and affects Chrome on Windows, macOS, and Linux. Google rated the Chromium security severity as High.

Critical Impact
Remote attackers can achieve arbitrary code execution inside the Chrome sandbox through a single crafted web page, enabling drive-by compromise of unpatched browsers.

Affected Products

Google Chrome versions prior to 149.0.7827.103
Chrome on Microsoft Windows, Apple macOS, and Linux
Chromium-based downstream browsers using vulnerable V8 builds

Discovery Timeline

2026-06-09 - CVE-2026-11649 published to NVD
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11649

Vulnerability Analysis

The flaw is a use-after-free condition inside V8, the JavaScript and WebAssembly engine that powers Chrome. Use-after-free bugs arise when code continues to reference a memory region after that region has been freed. In V8, such conditions typically occur during JavaScript object lifecycle management, garbage collection interactions, or optimization pipeline transitions.

When an attacker triggers the dangling reference through crafted JavaScript, the freed memory can be reclaimed and populated with attacker-controlled data. Subsequent operations on the stale pointer then operate on attacker-supplied content, enabling type confusion, arbitrary read/write primitives, and ultimately remote code execution within the renderer sandbox.

The attack requires user interaction in the form of visiting a malicious page. Code execution remains contained within the Chrome sandbox, but it can be chained with a sandbox escape to achieve full system compromise.

Root Cause

The root cause is improper memory lifetime management in V8 [CWE-416]. An object is freed while another code path retains a reference to it, allowing later access to deallocated memory. Public technical details have not been released by Google. Refer to the Chromium Issue Tracker Entry for upstream tracking.

Attack Vector

Exploitation proceeds over the network through standard web browsing. An attacker hosts a crafted HTML page containing JavaScript that triggers the vulnerable V8 code path. When a victim visits the page, the exploit primitives are constructed in-browser and used to execute arbitrary code within the renderer process.

Delivery vectors include malicious advertisements, compromised legitimate sites, phishing links, and watering-hole campaigns targeting specific user populations.

// No verified proof-of-concept code is publicly available.
// See the Chromium Issue Tracker for upstream technical references.

Detection Methods for CVE-2026-11649

Indicators of Compromise

Renderer process crashes (chrome.exe, Google Chrome Helper) followed by unexpected child process creation
Chrome processes spawning shells, scripting hosts, or LOLBins such as powershell.exe, cmd.exe, or bash
Outbound connections from renderer processes to unfamiliar domains hosting heap-spray-heavy JavaScript payloads
Browser telemetry showing repeated visits to newly registered or low-reputation domains preceding renderer instability

Detection Strategies

Hunt for anomalous child processes of Chrome renderer and helper processes across endpoint telemetry
Correlate Chrome version inventory data against the fixed build 149.0.7827.103 to surface vulnerable hosts
Inspect web proxy logs for HTML responses containing large repetitive ArrayBuffer or typed-array allocations characteristic of V8 exploitation

Monitoring Recommendations

Enable EDR process-lineage logging on all endpoints running Chrome
Forward browser version inventory and crash dumps to a centralized data lake for version-drift and exploitation-attempt analysis
Alert on Chrome renderer crashes that precede privileged operations or network egress to untrusted destinations

How to Mitigate CVE-2026-11649

Immediate Actions Required

Update Google Chrome to version 149.0.7827.103 or later on all Windows, macOS, and Linux endpoints
Restart browser instances after deployment to ensure the patched V8 binary is loaded
Audit Chromium-based browsers (Edge, Brave, Opera, Vivaldi) and apply vendor updates that incorporate the fixed V8 build

Patch Information

Google released the fix in the Chrome Stable channel update referenced in the Google Chrome Update Blog. Administrators should validate enterprise update channels, force update policies via Group Policy or MDM, and verify the deployed build is 149.0.7827.103 or newer.

Workarounds

Disable JavaScript on untrusted sites via Chrome site settings or enterprise policy where feasible
Restrict browsing to known-good destinations through DNS filtering or secure web gateways until patching is complete
Enforce Site Isolation and ensure the renderer sandbox is active to limit blast radius on unpatched hosts

bash

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

# Windows: query installed version via registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

# macOS: query installed version
defaults read "/Applications/Google Chrome.app/Contents/Info.plist" CFBundleShortVersionString