CVE-2026-17716: Google Chrome Privilege Escalation Flaw

CVE-2026-17716 Overview

CVE-2026-17716 is a use-after-free vulnerability [CWE-416] in the Updater component of Google Chrome on macOS. The flaw affects Chrome versions prior to 151.0.7922.72 and allows a local attacker to achieve privilege escalation through malicious network traffic. Google's Chromium project rated the security severity as High.

The vulnerability resides in the auto-update mechanism, which typically runs with elevated privileges on macOS to install updates. Successful exploitation lets an attacker on an adjacent network execute code in the context of the Updater process, bypassing user-level restrictions.

Critical Impact
Local privilege escalation on macOS endpoints running vulnerable Chrome builds, with attack traffic delivered from an adjacent network position.

Affected Products

Google Chrome for macOS prior to 151.0.7922.72
Chromium-based builds sharing the same Updater component on macOS
Enterprise-managed Chrome deployments on macOS without forced auto-update enforcement

Discovery Timeline

2026-07-30 - CVE-2026-17716 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-17716

Vulnerability Analysis

The vulnerability is a use-after-free in the Google Chrome Updater on macOS. Use-after-free conditions occur when a program continues to reference memory after it has been freed, letting an attacker manipulate the reused allocation to gain control of execution flow.

On macOS, the Chrome Updater (GoogleUpdater) coordinates automatic software updates and runs as a privileged helper. Because the flawed code path can be reached through network traffic processed by the Updater, an attacker on the same broadcast domain can trigger the freed-object reuse and pivot into privileged execution.

The attack chain requires adjacent network access, no privileges, and no user interaction. The confidentiality, integrity, and availability impact are each rated High because successful exploitation yields code execution in a privileged updater process.

Root Cause

The root cause is improper object lifetime management in the Updater's network-handling code. An object referenced during update-related message processing is released while a dangling pointer remains reachable. Subsequent operations dereference that pointer, producing memory corruption that an attacker can shape into arbitrary code execution.

Attack Vector

Exploitation requires an attacker positioned on an adjacent network, such as the same Wi-Fi segment or local subnet as the target. The attacker sends crafted network traffic that the Updater processes, triggering the use-after-free during message deserialization or state transitions. See the Chromium Issue Tracker #521866061 for the tracking bug.

No authenticated code example is publicly available. Refer to the Google Chrome Update Announcement for vendor-authoritative details.

Detection Methods for CVE-2026-17716

Indicators of Compromise

Unexpected child processes spawned by GoogleUpdater or ksadmin on macOS endpoints.
Crash reports referencing the Chrome Updater with memory access violations or heap corruption signatures.
Anomalous inbound traffic to Updater listener ports on local subnets, particularly from non-Google endpoints.

Detection Strategies

Inventory Chrome versions across macOS fleets and flag builds earlier than 151.0.7922.72.
Monitor process lineage for the Updater and alert on privilege transitions or unexpected binary loads.
Correlate Updater crashes with adjacent-network activity to identify probing or exploitation attempts.

Monitoring Recommendations

Enable endpoint telemetry that captures process creation, network connections, and code-signing anomalies on macOS.
Log and review LaunchDaemon and LaunchAgent modifications tied to Chrome auto-update paths.
Baseline normal Updater network behavior and alert on deviations, especially traffic from adjacent hosts.

How to Mitigate CVE-2026-17716

Immediate Actions Required

Update Google Chrome on macOS to version 151.0.7922.72 or later on all managed endpoints.
Verify that Chrome auto-update is enabled and not blocked by network policies or MDM configuration.
Restrict adjacent network exposure of macOS clients by segmenting untrusted Wi-Fi and guest networks.

Patch Information

Google released the fix in Chrome 151.0.7922.72 for macOS through the Stable channel. Consult the Google Chrome Update Announcement for release details and the Chromium Issue Tracker #521866061 for the underlying bug reference.

Workarounds

Isolate macOS devices from untrusted local networks until patches are applied.
Use MDM tooling to force Chrome updates and prevent version rollback on managed Macs.
Disable or restrict the Chrome Updater service on endpoints where centralized patch deployment is in use, then re-enable after updating.

bash

# Verify installed Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version

# Force an update check via the Google Updater
/Library/Google/GoogleUpdater/Current/GoogleUpdater.app/Contents/MacOS/GoogleUpdater --wake-all