CVE-2026-7974: Google Chrome Use After Free Vulnerability

CVE-2026-7974 Overview

CVE-2026-7974 is a use-after-free vulnerability [CWE-416] in the Blink rendering engine of Google Chrome. The flaw affects all Chrome versions prior to 148.0.7778.96 across Windows, macOS, and Linux. A remote attacker can exploit the issue by serving a crafted HTML page to a target browser. Successful exploitation allows arbitrary code execution within the Chrome renderer sandbox. Google addressed the defect in the Stable Channel update for desktop published on its Chrome Releases blog.

Critical Impact
Remote attackers can achieve arbitrary code execution inside the Chrome renderer sandbox by luring users to a malicious web page, providing a foothold for further sandbox-escape chains.

Affected Products

Google Chrome versions prior to 148.0.7778.96
Chrome on Microsoft Windows, Apple macOS, and Linux desktops
Chromium-based browsers that embed the vulnerable Blink build

Discovery Timeline

2026-05-06 - CVE-2026-7974 published to NVD
2026-05-06 - Last updated in NVD database

Technical Details for CVE-2026-7974

Vulnerability Analysis

The vulnerability resides in Blink, the rendering engine that parses HTML, CSS, and the Document Object Model (DOM) inside Chrome. Blink manages object lifetimes through a combination of garbage-collected and reference-counted heaps. A use-after-free condition occurs when code retains a raw pointer to an object that has already been freed and later dereferences it. Attackers reuse the freed slot with attacker-controlled data, then trigger the dangling reference to redirect execution. In Blink, such primitives typically lead to type confusion, virtual table hijacking, and renderer-process code execution. The Chromium team rates the underlying defect Medium severity, while the network-reachable, low-complexity nature of the attack drives the higher external scoring.

Root Cause

The root cause is improper object lifetime management within Blink [CWE-416]. A code path frees a heap-allocated DOM or rendering object while another code path still holds a usable pointer. Subsequent operations on that pointer read or write memory that has been reallocated for a different purpose, breaking type and memory safety guarantees in the renderer process.

Attack Vector

Exploitation requires a victim to load attacker-controlled HTML in a vulnerable Chrome build. The attacker hosts a malicious page or injects content into a compromised site, then drives the browser through a sequence of DOM manipulations that frees an object while a stale reference remains. Heap grooming via JavaScript reclaims the freed memory, and the dangling pointer is used to pivot into arbitrary code execution within the sandboxed renderer. A separate sandbox-escape vulnerability is required to break out to the host operating system.

No public proof-of-concept code is referenced in the advisory. Technical details are tracked in the Chromium Issue Tracker entry.

Detection Methods for CVE-2026-7974

Indicators of Compromise

Chrome renderer processes spawning unexpected child processes such as cmd.exe, powershell.exe, or shell binaries on macOS and Linux.
Outbound connections from chrome.exe to newly registered or low-reputation domains immediately after page loads.
Unexpected file writes by Chrome to user profile or temporary directories containing executable content.

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any host running a build older than 148.0.7778.96.
Hunt for renderer crashes with access-violation signatures in Windows Error Reporting and crashpad logs that correlate with browsing activity.
Correlate web proxy logs with endpoint telemetry to identify users who visited suspicious URLs followed by anomalous Chrome process behavior.

Monitoring Recommendations

Forward browser process telemetry, DNS queries, and HTTP proxy events into a centralized analytics platform for cross-source correlation.
Alert on Chrome child processes that deviate from the standard chrome.exe --type= argument set, particularly those without a --type flag spawning interactive shells.
Track patch compliance metrics and trigger alerts when endpoints remain on vulnerable Chrome builds beyond the organization's remediation window.

How to Mitigate CVE-2026-7974

Immediate Actions Required

Update Google Chrome to version 148.0.7778.96 or later on all Windows, macOS, and Linux endpoints.
Restart the browser after the update so all renderer and utility processes load the patched Blink binaries.
Audit Chromium-based browsers and Electron applications for embedded Blink versions and apply vendor updates as they become available.

Patch Information

Google released the fix in the Chrome Stable Channel update announced on the Chrome Releases blog. Enterprises managing Chrome through Group Policy, Jamf, or Intune should push the updated installer or enable automatic updates. Verify the deployed build by navigating to chrome://settings/help and confirming the version string matches 148.0.7778.96 or higher.

Workarounds

Restrict browsing to trusted destinations through enterprise web filtering until patches are deployed organization-wide.
Enforce Chrome's Site Isolation and disable JavaScript on untrusted origins via the URLBlocklist and DefaultJavaScriptSetting policies where business processes allow.
Deploy attack surface reduction controls that block Chrome from spawning script interpreters and command shells.

bash

# Configuration example: enforce minimum Chrome version via Windows Group Policy registry
reg add "HKLM\Software\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "148.0.7778.96" /f
reg add "HKLM\Software\Policies\Google\Chrome" /v RelaunchNotification /t REG_DWORD /d 2 /f
reg add "HKLM\Software\Policies\Google\Chrome" /v RelaunchNotificationPeriod /t REG_DWORD /d 86400000 /f