CVE-2026-16423: Google Chrome Use After Free Vulnerability

CVE-2026-16423 Overview

CVE-2026-16423 is a use-after-free vulnerability in the UI component of Google Chrome prior to version 150.0.7871.182. A remote attacker can exploit this flaw by convincing a user to perform specific UI gestures on a crafted HTML page, triggering heap corruption. Successful exploitation may lead to arbitrary code execution within the browser process. The Chromium project has rated the security severity as High. The vulnerability is tracked as CWE-416: Use After Free.

Critical Impact
Remote attackers can achieve heap corruption and potentially execute arbitrary code by luring users to malicious web pages and inducing specific UI interactions.

Affected Products

Google Chrome Desktop versions prior to 150.0.7871.182
Chromium-based browsers embedding vulnerable UI code paths
All supported desktop platforms (Windows, macOS, Linux) running affected Chrome builds

Discovery Timeline

2026-07-21 - CVE-2026-16423 published to NVD
2026-07-22 - Last updated in NVD database

Technical Details for CVE-2026-16423

Vulnerability Analysis

The vulnerability is a use-after-free (UAF) condition within Chrome's UI subsystem. UAF flaws occur when a program continues to reference memory after it has been freed, allowing an attacker to manipulate the freed allocation and hijack control flow when the dangling pointer is dereferenced.

Exploitation requires user interaction. An attacker must convince a victim to visit a crafted HTML page and perform specific UI gestures that trigger the vulnerable code path. Once triggered, the flaw enables heap corruption inside the renderer or browser process, which can be chained with a sandbox escape for full compromise.

Because the bug resides in a UI component reachable from web content, standard drive-by attack scenarios apply. Public exploitation has not been reported, and the vulnerability is not listed on the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is improper lifetime management of a UI object. Code retains a reference to a heap allocation after the object has been destroyed, producing a dangling pointer. Attacker-controlled reallocation of the freed slot allows manipulation of object internals such as vtables or function pointers.

Attack Vector

The attack vector is network-based via a crafted HTML page. The attacker must persuade the user to engage in specific UI gestures on the page. See the Chromium Issue #534582496 and the Google Chrome Desktop Update for details.

No verified proof-of-concept code is publicly available. The vulnerability mechanism is described in prose only; refer to the linked Chromium tracker for technical specifics once access restrictions are lifted.

Detection Methods for CVE-2026-16423

Indicators of Compromise

Chrome renderer or browser process crashes with heap corruption signatures shortly after user interaction with an untrusted page
Unexpected child processes spawned from chrome.exe following web browsing activity
Outbound connections to unfamiliar domains immediately preceding a browser crash event

Detection Strategies

Inventory endpoint Chrome versions and flag any host running a build earlier than 150.0.7871.182
Monitor Windows Error Reporting, macOS CrashReporter, and Linux core dumps for Chrome UAF crash signatures
Correlate browser crash telemetry with recent navigation history to identify suspicious originating URLs

Monitoring Recommendations

Ingest browser process telemetry and crash logs into a centralized SIEM for cross-host correlation
Alert on Chrome processes making anomalous system calls or spawning shell interpreters
Track proxy and DNS logs for repeated visits to domains associated with browser crashes across multiple users

How to Mitigate CVE-2026-16423

Immediate Actions Required

Update all Google Chrome installations to version 150.0.7871.182 or later on Windows, macOS, and Linux endpoints
Force a browser restart across managed fleets to ensure the patched binary is loaded
Audit Chromium-based third-party browsers and embedded webviews for equivalent upstream fixes

Patch Information

Google addressed CVE-2026-16423 in the Chrome Stable channel release documented in the Google Chrome Desktop Update. Administrators should deploy Chrome 150.0.7871.182 or later. Enterprises using Chrome Browser Cloud Management or group policy should verify auto-update enforcement and confirm the target version is installed on all endpoints.

Workarounds

Restrict browsing to trusted sites via enterprise policy until patching is complete
Deploy site isolation and enhanced sandboxing policies through Chrome Enterprise settings
Educate users to avoid engaging with unfamiliar UI prompts or gestures on untrusted pages

bash

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

# Force Chrome update via policy on Windows (PowerShell)
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Google\Update' -Name 'UpdateDefault' -Value 1