CVE-2026-14405: Google Chrome V8 RCE Vulnerability

CVE-2026-14405 Overview

CVE-2026-14405 is an uninitialized memory use vulnerability in the V8 JavaScript engine used by Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.46. A remote attacker can exploit this issue by convincing a user to visit a crafted HTML page. Successful exploitation permits arbitrary code execution within the Chrome sandbox. The weakness is classified under CWE-457: Use of Uninitialized Variable. Chromium engineers rated the underlying V8 issue as low severity, but the network attack vector and code execution potential place this issue in the critical range under CVSS scoring.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome sandbox by luring users to a malicious web page, creating a foothold for browser exploit chains.

Affected Products

Google Chrome versions prior to 150.0.7871.46
Chromium-based browsers embedding vulnerable V8 builds
Desktop stable channel builds of Chrome for Windows, macOS, and Linux

Discovery Timeline

2026-07-01 - CVE-2026-14405 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-14405

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that powers Chrome. V8 uses an uninitialized value during execution, which an attacker can influence through carefully constructed JavaScript on an HTML page. Reading uninitialized memory allows an attacker to leak or corrupt engine state and steer control flow. The result is arbitrary code execution constrained by the Chrome renderer sandbox. Exploitation still requires user interaction, since the victim must load the attacker-controlled page. Details are tracked in the Chromium Issue Tracker Entry and the Chrome Blog Update.

Root Cause

The root cause is an uninitialized variable use inside V8 [CWE-457]. Code paths in the engine read from a memory location before it has been assigned a defined value. When attacker-controlled JavaScript triggers those paths, the engine operates on stale or predictable data. This condition breaks V8's type and memory safety assumptions and enables further exploitation primitives.

Attack Vector

An attacker hosts a crafted HTML page that loads JavaScript designed to trigger the vulnerable V8 code path. When a victim visits the page, the renderer processes the payload and executes attacker code inside the sandboxed process. The attack requires no authentication and works across the network. Chaining this issue with a sandbox escape would allow full compromise of the client system.

No public exploit code has been published for CVE-2026-14405. Technical details are limited to the Chromium issue tracker and the Chrome release notes referenced above.

Detection Methods for CVE-2026-14405

Indicators of Compromise

Chrome renderer processes spawning unexpected child processes or shell interpreters shortly after browsing activity
Outbound connections from chrome.exe or Chromium Helper processes to unfamiliar domains hosting .html or .js payloads
Crash reports in Chrome referencing V8 memory access violations following visits to untrusted sites

Detection Strategies

Inventory endpoints running Chrome builds earlier than 150.0.7871.46 using software asset management or EDR telemetry
Alert on process lineage where Chrome renderer processes launch scripting hosts such as powershell.exe, cmd.exe, or bash
Monitor for browser exploit indicators including unexpected memory allocations, RWX pages, or shellcode patterns inside renderer processes

Monitoring Recommendations

Collect Chrome crash telemetry and correlate it with URL browsing history to identify targeted exploitation attempts
Ingest DNS and HTTP proxy logs to identify visits to newly registered or low-reputation domains hosting HTML content
Track Chrome update compliance across managed endpoints and flag machines that fail to reach the patched version

How to Mitigate CVE-2026-14405

Immediate Actions Required

Update Google Chrome to version 150.0.7871.46 or later on all managed endpoints
Restart browser sessions after applying the update to ensure the patched V8 build is loaded
Audit Chromium-based applications and embedded browsers for updated V8 components

Patch Information

Google released the fix in the Chrome stable channel update announced in the Chrome Blog Update. Administrators should deploy Chrome 150.0.7871.46 or later through their standard update mechanism. Enterprises using Chrome Browser Cloud Management or group policy should verify that automatic updates are enforced and not deferred beyond the release window.

Workarounds

Restrict browsing to trusted sites through URL filtering or secure web gateways until patching completes
Disable JavaScript on high-risk endpoints where feasible, since exploitation requires JavaScript execution in V8
Deploy site isolation and enhanced sandbox policies available in Chrome enterprise configuration

bash

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

# Windows: query installed Chrome version via registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version

# Enforce automatic updates via Chrome policy (Linux example)
cat >/etc/opt/chrome/policies/managed/update_policy.json <<EOF
{
  "DefaultBrowserSettingEnabled": true,
  "ComponentUpdatesEnabled": true
}
EOF