CVE-2026-7928: Google Chrome Use-After-Free Vulnerability

CVE-2026-7928 Overview

CVE-2026-7928 is a use-after-free vulnerability in the Web Real-Time Communication (WebRTC) component of Google Chrome on Windows. The flaw affects all Chrome versions prior to 148.0.7778.96. A remote attacker can exploit this issue by hosting a crafted HTML page and luring a user to visit it. Successful exploitation allows arbitrary code execution inside the Chrome renderer sandbox. Google classifies the Chromium security severity as High and tracks the underlying defect under [CWE-416].

Critical Impact

Remote attackers can execute arbitrary code inside the Chrome renderer sandbox on Windows hosts via a crafted web page, providing a foothold for further sandbox escape chains.

Affected Products

• Google Chrome on Windows versions prior to 148.0.7778.96
• Microsoft Windows hosts running affected Chrome builds
• Chromium-based browsers that share the vulnerable WebRTC code path

Discovery Timeline

• 2026-05-06 - CVE-2026-7928 published to the National Vulnerability Database (NVD)
• 2026-05-06 - Last updated in NVD database
• 2026-05 - Google releases fix in the Stable channel update for desktop (Google Chrome Release Notes)

Technical Details for CVE-2026-7928

Vulnerability Analysis

The vulnerability resides in Chrome's WebRTC implementation, the subsystem responsible for real-time audio, video, and data channel communications between browsers. WebRTC objects have complex lifetimes spanning multiple threads, including the renderer's main thread and dedicated network and media worker threads. A use-after-free condition occurs when code retains a reference to a WebRTC object that has already been released. The freed memory can then be reclaimed and shaped by attacker-controlled allocations.

An attacker who reaches this state can corrupt object metadata, redirect virtual function calls, and ultimately execute arbitrary code within the renderer process. Code execution remains confined to the Chrome sandbox, but the renderer is a common starting point for sandbox escape exploit chains. The Chromium issue tracking entry is referenced at Chromium Issue Tracker Entry.

Root Cause

The defect maps to [CWE-416] Use After Free. WebRTC peer connection or data channel objects are freed while another component still holds a dangling pointer. Subsequent dereferences of that pointer operate on memory whose contents the attacker can influence through targeted JavaScript and WebRTC API calls.

Attack Vector

Exploitation requires the victim to load a crafted HTML page in an unpatched Chrome build. The attacker page initiates WebRTC operations, such as creating peer connections or data channels, and triggers the specific lifecycle sequence that frees an object still in use. No authentication is required, and exploitation succeeds across the network with a single user interaction.

No verified public proof-of-concept code is available for CVE-2026-7928 at the time of publication. Refer to the Chromium Issue Tracker Entry once Google removes view restrictions for technical specifics.

Detection Methods for CVE-2026-7928

Indicators of Compromise

• Chrome renderer process crashes (chrome.exe child processes) referencing WebRTC modules such as peerconnection, webrtc.dll, or libwebrtc symbols in Windows Error Reporting data.
• Outbound Session Traversal Utilities for NAT (STUN) or Traversal Using Relays around NAT (TURN) traffic to attacker-controlled infrastructure initiated by browsing sessions on unexpected sites.
• Endpoint telemetry showing Chrome renderer processes spawning unexpected child processes or performing anomalous file and registry writes after visiting an untrusted page.

Detection Strategies

• Inventory installed Chrome versions across Windows endpoints and flag any build below 148.0.7778.96.
• Hunt for renderer crash dumps tagged with use-after-free signatures in WebRTC frames using existing crash telemetry pipelines.
• Correlate web proxy logs with endpoint browsing telemetry to identify users visiting low-reputation domains that initiate WebRTC sessions.

Monitoring Recommendations

• Stream Chrome process telemetry, browser extension events, and WebRTC connection metadata into a central analytics platform for retrospective hunting.
• Alert on Chrome renderer processes performing post-exploitation behaviors such as code injection, suspicious DLL loads, or token manipulation on Windows.
• Track Google's Stable channel release feed and automate alerting when new Chrome security advisories reference WebRTC or renderer components.

How to Mitigate CVE-2026-7928

Immediate Actions Required

• Update Google Chrome on all Windows endpoints to version 148.0.7778.96 or later and restart the browser to apply the fix.
• Force a managed update through enterprise deployment tooling rather than relying solely on background updates for at-risk users.
• Audit Chromium-based browsers and embedded browser frameworks in your environment to confirm they have absorbed the upstream WebRTC patch.

Patch Information

Google addressed CVE-2026-7928 in the Stable channel update for desktop that ships Chrome 148.0.7778.96 for Windows. Details are published in the Google Chrome Release Notes. Apply the vendor-supplied update as the primary remediation.

Workarounds

• Disable or restrict WebRTC functionality through enterprise policy where business workflows do not require it, using the WebRtcAllowLegacyTLSProtocols and related Chrome policies to limit exposure.
• Apply browsing restrictions and category-based web filtering at the proxy or secure web gateway to block access to untrusted sites until patching is complete.
• Enforce least privilege on Windows user accounts so that any post-sandbox-escape activity is contained to a low-privilege context.

# Verify deployed Chrome version on a Windows endpoint via PowerShell
(Get-Item "$env:ProgramFiles\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion

# Example Group Policy registry path to enforce minimum version through management tooling
# HKLM\SOFTWARE\Policies\Google\Chrome\TargetVersionPrefix = "148.0.7778.96"