CVE-2026-78909: Google Chrome Use After Free Vulnerability

CVE-2026-78909 Overview

CVE-2026-78909 is a use-after-free vulnerability in the Views component of Google Chrome prior to version 152.0.7977.65. A remote attacker can leverage social engineering to trick a user into interacting with a crafted HTML page, triggering the flaw and executing arbitrary code outside the Chrome sandbox. The vulnerability is classified under CWE-416 and requires user interaction to succeed. Google has addressed the issue in the Stable Channel update for Desktop.

Critical Impact
Successful exploitation allows arbitrary code execution outside the browser sandbox, giving attackers full control over the affected user context on Windows, macOS, and Linux systems.

Affected Products

Google Chrome for Desktop prior to 152.0.7977.65
Chromium-based builds incorporating the vulnerable Views component
All supported desktop platforms (Windows, macOS, Linux)

Discovery Timeline

2026-08-25 - CVE-2026-78909 published to NVD
2026-08-27 - Last updated in NVD database

Technical Details for CVE-2026-78909

Vulnerability Analysis

The flaw resides in Chrome's Views framework, the cross-platform UI toolkit that renders browser windows, menus, and dialogs. A use-after-free condition occurs when Views code retains a reference to a UI object after that object's memory has been released. When the dangling pointer is later dereferenced, an attacker who controls the freed memory layout can redirect execution flow.

Because Views runs in the browser process rather than the sandboxed renderer, exploitation grants code execution outside the Chrome sandbox. This removes the primary containment layer that Chrome relies on to limit renderer compromises. The attack requires user interaction, typically a social-engineering lure that convinces the target to load a crafted HTML page or perform a specific UI action.

Root Cause

The root cause is improper object lifetime management inside the Views component. Chromium tracks this as Chromium Issue #501637242. Public technical detail is restricted pending broad patch adoption, consistent with Chrome's standard disclosure practice. The class of bug, CWE-416 Use After Free, typically stems from asynchronous UI callbacks referencing objects destroyed by a prior teardown path.

Attack Vector

An attacker hosts a crafted HTML page and lures a user into visiting it, likely combining the page with a UI interaction such as a prompt, dialog, or drag-and-drop action that reaches the vulnerable Views code path. Because the affected code runs in the trusted browser process, a successful exploit bypasses the renderer sandbox and executes code with the browser's privileges.

No public proof-of-concept is available at the time of publication. Refer to the Google Chrome Stable Update for vendor-confirmed details.

Detection Methods for CVE-2026-78909

Indicators of Compromise

Chrome browser processes spawning unexpected child processes such as cmd.exe, powershell.exe, or shell interpreters outside normal update or crash-reporter workflows.
Unexpected outbound network connections from chrome.exe to unfamiliar hosts immediately after a user visits an untrusted page.
Chrome crash reports referencing the Views component or unexpected access violations in the browser process.

Detection Strategies

Inventory Chrome versions across managed endpoints and flag any instance older than 152.0.7977.65.
Monitor for anomalous process lineage where chrome.exe is the parent of scripting hosts, LOLBins, or persistence-related binaries.
Correlate browser crashes with subsequent process creation or network events to surface post-exploitation activity.

Monitoring Recommendations

Ingest browser telemetry, EDR process events, and DNS logs into a central data lake for cross-source correlation.
Alert on Chrome writing executables or scripts to user-writable directories such as %APPDATA% or %TEMP%.
Track HTML lure delivery vectors including email attachments, messaging platforms, and newly registered domains referenced by browser navigation logs.

How to Mitigate CVE-2026-78909

Immediate Actions Required

Update all Chrome desktop installations to version 152.0.7977.65 or later without delay.
Force-restart the browser after the update; Chrome does not apply patches until the process is relaunched.
Audit Chromium-based enterprise deployments and managed browser policies to confirm the fixed build is enforced.

Patch Information

Google released the fix in the Stable Channel update announced in the Google Chrome Stable Update. Enterprise administrators should push the update through Group Policy, MDM, or the Chrome Browser Cloud Management console and verify the effective version on endpoints. Chromium-derived browsers should be updated when their vendors publish rebased releases.

Workarounds

No vendor-approved workaround exists; upgrading to the patched build is the only supported remediation.
Reinforce user awareness against social-engineering lures that instruct visits to unfamiliar HTML pages.
Restrict browser execution privileges and apply application allowlisting to limit post-exploitation impact until patching completes.

bash

# Verify installed Chrome version on Windows
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

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

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