CVE-2026-14018 Overview
CVE-2026-14018 is a use-after-free vulnerability [CWE-416] in the Updater component of Google Chrome on Windows. The flaw affects Chrome versions prior to 150.0.7871.47. A local attacker who places a malicious file on the system can trigger the use-after-free condition in the Chrome Updater process. Successful exploitation leads to operating system privilege escalation, allowing the attacker to execute code with elevated privileges. Google's Chromium team rated the security severity as Medium, while the NVD assigns a CVSS 3.1 base score of 7.8 (HIGH). No public exploit code is available at this time, and the vulnerability is not listed on the CISA Known Exploited Vulnerabilities catalog.
Critical Impact
Local attackers can escalate to OS-level privileges on Windows hosts running vulnerable Chrome builds by leveraging a malicious file processed by the Updater.
Affected Products
- Google Chrome on Windows versions prior to 150.0.7871.47
- Microsoft Windows platforms running the affected Chrome Updater component
- Chromium-based deployments that reuse the vulnerable Updater code path
Discovery Timeline
- 2026-06-30 - CVE-2026-14018 published to the National Vulnerability Database
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-14018
Vulnerability Analysis
The defect resides in the Chrome Updater, the Windows service responsible for keeping the browser current. A use-after-free condition [CWE-416] occurs when the Updater continues to reference an object in memory after that object has been freed. An attacker who controls the freed allocation can influence subsequent operations performed through the dangling pointer. Because the Updater runs with elevated rights on Windows, the memory corruption crosses a trust boundary. This turns a local user-context primitive into an OS-level privilege escalation.
Root Cause
The root cause is improper object lifetime management inside the Updater. A file-handling path releases a heap object while another code path still holds a reference to it. When the stale reference is dereferenced, attacker-controlled data can be interpreted as a valid object, corrupting execution state. Google's fix is shipped in Chrome 150.0.7871.47, indicating tightened ownership or reference counting in the affected Updater routine.
Attack Vector
Exploitation requires local access and user interaction. The attacker plants a malicious file on the system, then induces the Updater to process it. Because privileges required are none but user interaction is required, common delivery paths include drive-by downloads, shared folders, or secondary payloads dropped after initial access. Successful exploitation yields high impact to confidentiality, integrity, and availability.
No verified proof-of-concept code has been published. Technical details are available in the Google Chrome Update Announcement and the Chromium Issue Tracker Entry.
Detection Methods for CVE-2026-14018
Indicators of Compromise
- Unexpected child processes spawned by GoogleUpdater.exe or the Chrome Updater service running with SYSTEM privileges
- Creation or modification of files in the Chrome Updater working directories by non-administrative users
- Crashes or Windows Error Reporting events referencing the Chrome Updater module prior to a privilege change
Detection Strategies
- Hunt for process lineage anomalies where the Chrome Updater launches shells, script interpreters, or LOLBins such as cmd.exe, powershell.exe, or rundll32.exe
- Alert on writes to Updater directories originating from standard user accounts, followed by Updater activity within a short time window
- Correlate Chrome Updater crashes with subsequent token elevation events (Windows Event ID 4672) on the same host
Monitoring Recommendations
- Inventory Chrome versions across the fleet and flag any host running a build below 150.0.7871.47
- Monitor Sysmon Event ID 1 (process create) and Event ID 11 (file create) with a focus on the Updater install path
- Baseline normal Updater behavior and alert on deviations such as unusual command lines or unsigned child binaries
How to Mitigate CVE-2026-14018
Immediate Actions Required
- Update Google Chrome to version 150.0.7871.47 or later on all Windows endpoints
- Verify that the Chrome Updater service is running the patched binaries and has not been disabled by policy
- Restrict local write access to directories consumed by the Chrome Updater to trusted accounts only
Patch Information
Google addressed CVE-2026-14018 in the Stable channel release documented in the Google Chrome Update Announcement. Administrators should enforce the update through enterprise management tooling or Chrome's built-in update mechanism. The corresponding Chromium bug is tracked in the Chromium Issue Tracker Entry.
Workarounds
- Apply application control policies that block execution of unsigned files from user-writable Updater directories
- Reduce local attack surface by removing unnecessary local administrative privileges and enforcing least privilege
- Where patching is delayed, use endpoint controls to monitor and constrain the Chrome Updater process behavior
# Verify installed Chrome version on Windows via PowerShell
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
# Force update check through the Chrome Updater
& "C:\Program Files (x86)\Google\Update\GoogleUpdate.exe" /ua /installsource scheduler
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
