CVE-2026-16420 Overview
CVE-2026-16420 is a type confusion vulnerability in the WebAudio component of Google Chrome versions prior to 150.0.7871.182. A remote attacker can exploit the flaw by serving a crafted HTML page, achieving arbitrary code execution inside the Chrome sandbox. Google classified the Chromium security severity as High. The vulnerability is tracked under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion'). Google has released a fix in the stable channel desktop update.
Critical Impact
A remote attacker can execute arbitrary code inside the Chrome renderer sandbox by convincing a victim to visit a malicious webpage.
Affected Products
- Google Chrome for Desktop prior to version 150.0.7871.182
- WebAudio component within the Chromium rendering engine
- Chromium-based browsers that inherit the vulnerable WebAudio implementation
Discovery Timeline
- 2026-07-21 - CVE-2026-16420 published to NVD
- 2026-07-21 - Last updated in NVD database
Technical Details for CVE-2026-16420
Vulnerability Analysis
The vulnerability resides in WebAudio, the Chromium subsystem responsible for processing and synthesizing audio in the browser. Type confusion occurs when code allocates or accesses a resource using one type but later interprets it as an incompatible type. In this case, the flaw allows a crafted HTML page containing malicious JavaScript to manipulate WebAudio objects in a way that violates type assumptions in the renderer process.
Exploitation yields arbitrary code execution inside the sandbox. While the Chrome sandbox constrains the impact, attackers routinely chain such renderer bugs with sandbox escapes to gain broader system access. The EPSS probability for this CVE is 0.243%.
Root Cause
The root cause is improper type handling within the WebAudio implementation. When JavaScript interacts with WebAudio nodes and buffers, the engine fails to enforce consistent type checks across object lifetimes. An attacker can trigger operations that cause an object to be reinterpreted as an incompatible type, corrupting memory layout assumptions and enabling controlled reads or writes.
Attack Vector
Exploitation requires a victim to load a malicious HTML page in a vulnerable Chrome build. No authentication is required, and the attack executes remotely over the network. The crafted page uses JavaScript WebAudio APIs to trigger the type confusion condition, producing a memory corruption primitive suitable for arbitrary code execution within the renderer process. See the Chromium Issue Tracker Entry and Google Blog Chrome Update for vendor-provided details.
Detection Methods for CVE-2026-16420
Indicators of Compromise
- Chrome renderer process crashes or unexpected terminations with WebAudio module frames on the call stack.
- Outbound network connections initiated by chrome.exe renderer children to unfamiliar hosts shortly after browsing untrusted sites.
- Presence of Chrome versions earlier than 150.0.7871.182 in endpoint inventory.
Detection Strategies
- Inventory installed Chrome versions across managed endpoints and flag any host running a version prior to 150.0.7871.182.
- Monitor browser child process behavior for anomalous file writes, process launches, or code injection originating from renderer processes.
- Correlate web proxy logs with browser telemetry to identify visits to pages that trigger renderer crashes.
Monitoring Recommendations
- Enable enterprise browser reporting to centralize crash telemetry and version compliance data.
- Alert on renderer processes spawning child processes such as cmd.exe, powershell.exe, or shell binaries on Linux and macOS.
- Track integrity levels and sandbox violations for Chrome processes using endpoint telemetry.
How to Mitigate CVE-2026-16420
Immediate Actions Required
- Update Google Chrome to version 150.0.7871.182 or later on all desktop endpoints.
- Restart the browser after updating to ensure the patched binaries are loaded.
- Verify that Chromium-based third-party browsers have absorbed the upstream fix and update accordingly.
Patch Information
Google published the fix in the stable channel desktop update. Administrators should reference the Google Blog Chrome Update release notes and confirm deployment through enterprise update policies. The Chromium bug is tracked in the Chromium Issue Tracker Entry.
Workarounds
- Enforce Chrome auto-update through group policy or MDM to ensure timely patch delivery.
- Restrict access to untrusted websites via web filtering until all endpoints are patched.
- Deploy site isolation and disable non-essential experimental WebAudio features where feasible.
# Verify installed Chrome version on Linux/macOS
google-chrome --version
# Windows: query installed version via registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
