CVE-2026-16418: Google Chrome V8 Buffer Overflow Flaw

CVE-2026-16418 Overview

CVE-2026-16418 is a stack buffer overflow vulnerability in the V8 JavaScript engine used by Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.182. A remote attacker can execute arbitrary code inside the Chrome renderer sandbox by convincing a user to visit a crafted HTML page. Google's Chromium security team rated this issue with High severity. The vulnerability is categorized under CWE-121: Stack-based Buffer Overflow.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome sandbox through a crafted HTML page, enabling drive-by compromise of users who visit malicious or attacker-controlled websites.

Affected Products

Google Chrome for Desktop versions prior to 150.0.7871.182
V8 JavaScript engine bundled with affected Chrome builds
Chromium-based browsers embedding vulnerable V8 versions

Discovery Timeline

2026-07-21 - CVE-2026-16418 published to NVD
2026-07-21 - Last updated in NVD database

Technical Details for CVE-2026-16418

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that executes untrusted code inside Chrome's renderer process. A stack buffer overflow occurs when V8 writes data beyond the bounds of a fixed-size buffer allocated on the call stack. Attackers can trigger the condition by delivering specially crafted JavaScript or WebAssembly through an HTML page.

Successful exploitation yields arbitrary code execution inside the renderer sandbox. While the Chrome sandbox restricts direct system access, renderer-level code execution provides a foothold for chaining a subsequent sandbox escape. Stack corruption in V8 is commonly leveraged to bypass address space layout randomization (ASLR) and hijack control flow.

Root Cause

The defect is classified as [CWE-121: Stack-based Buffer Overflow]. Root cause details are tracked privately in the Chromium Issue Tracker Entry and remain restricted while Google allows users time to update. Such issues in V8 typically arise from incorrect bounds checking in optimized code paths, inline caches, or WebAssembly compilation stages.

Attack Vector

Exploitation requires the victim to load a malicious HTML page in an unpatched Chrome build. The attacker delivers the payload through phishing links, compromised advertising, watering-hole websites, or malicious iframes on otherwise trusted domains. No authentication is required, and user interaction is limited to visiting the page. The Exploit Prediction Scoring System (EPSS) currently assigns a probability of 0.221% at the 12.7 percentile as of 2026-07-22.

See the Google Chrome Stable Update advisory for release-level details. No public proof-of-concept code has been released.

Detection Methods for CVE-2026-16418

Indicators of Compromise

Chrome renderer processes crashing with stack corruption signatures, access violations, or __stack_chk_fail terminations shortly after visiting a website
Unexpected child processes spawned by chrome.exe following browsing activity, including shells, script interpreters, or LOLBins
Outbound network connections initiated by renderer processes to previously unseen infrastructure

Detection Strategies

Inventory Chrome versions across the fleet and flag any host running a build older than 150.0.7871.182
Alert on browser exploitation patterns such as renderer process spawning cmd.exe, powershell.exe, wscript.exe, or writing executables to user-writable paths
Correlate browser crash telemetry with proxy and DNS logs to identify pages that trigger repeated renderer failures

Monitoring Recommendations

Ingest browser process telemetry, Windows Error Reporting, and macOS crash reports into your SIEM for centralized triage
Monitor endpoints for post-exploitation behaviors including credential access, persistence creation, and lateral movement following browser activity
Track outbound traffic from browser processes for connections to newly registered domains and known malicious infrastructure

How to Mitigate CVE-2026-16418

Immediate Actions Required

Update Google Chrome to version 150.0.7871.182 or later on all managed endpoints
Force-restart Chrome after deployment because the patch does not take effect until the browser process is relaunched
Update Chromium-based browsers (Edge, Brave, Opera, Vivaldi) once vendors publish rebased releases incorporating the V8 fix

Patch Information

Google released the fix in the Stable channel for Desktop. Users and administrators should upgrade to Chrome 150.0.7871.182 or later. Verify installed versions through chrome://settings/help or enterprise management tooling. Reference the Google Chrome Stable Update for the official release notes.

Workarounds

Enforce automatic Chrome updates through the ChromeCleanupEnabled and update policies in Group Policy or MDM so users cannot defer patches
Restrict JavaScript execution on untrusted sites using enterprise policies such as DefaultJavaScriptSetting where operationally feasible
Deploy web filtering to block access to newly registered or low-reputation domains that commonly host browser exploit kits

bash

# Verify installed Chrome version on Windows
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version

# Verify installed Chrome version on macOS
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString

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