CVE-2026-14108: Google Chrome Use-After-Free Flaw

CVE-2026-14108 Overview

CVE-2026-14108 is a use-after-free vulnerability in the PDFium component of Google Chrome. The flaw affects all Chrome desktop versions prior to 150.0.7871.47 across Windows, macOS, and Linux. A remote attacker can execute arbitrary code inside the Chrome sandbox by convincing a user to open a crafted PDF file. The vulnerability is tracked under CWE-416: Use After Free. Google's Chromium team rated the internal severity as Low, but the NVD assigned a CVSS 3.1 base score of 8.8 due to the network attack vector and full impact on confidentiality, integrity, and availability.

Critical Impact
Arbitrary code execution within the Chrome renderer sandbox via a malicious PDF, enabling attackers to chain the flaw with a sandbox escape for full system compromise.

Affected Products

Google Chrome desktop versions prior to 150.0.7871.47
Chrome on Apple macOS, Microsoft Windows, and Linux distributions
Any Chromium-based application embedding vulnerable PDFium builds

Discovery Timeline

2026-06-30 - CVE-2026-14108 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-14108

Vulnerability Analysis

PDFium is the open-source PDF rendering engine embedded in Chrome. The vulnerability is a use-after-free condition triggered during PDF parsing or object handling. When PDFium frees a heap-allocated object but retains a dangling reference, subsequent operations on that reference dereference memory that may have been reallocated with attacker-controlled data.

Attackers exploit use-after-free flaws in PDFium by grooming the renderer heap with crafted PDF objects. Reclaiming the freed slot with a controlled object allows the attacker to hijack function pointers or virtual table entries. Successful exploitation yields arbitrary code execution inside the renderer process, which runs within the Chrome sandbox.

While the sandbox limits immediate system-level impact, renderer compromise is a standard first stage in Chrome exploit chains. Historically, PDFium use-after-free bugs have been paired with sandbox escapes to achieve full endpoint compromise.

Root Cause

The root cause is improper object lifetime management in PDFium code paths that handle PDF document structures. A referenced object is freed while a pointer to it remains reachable, violating memory safety guarantees. See the Chromium Issue Tracker Entry for the underlying defect.

Attack Vector

The attack is network-based and requires user interaction. A victim must load a crafted PDF, either by visiting a malicious website that renders the file inline, opening a PDF attachment in Chrome, or following a link from a phishing message. No authentication is required. No public proof-of-concept or in-the-wild exploitation has been reported at time of publication.

Detection Methods for CVE-2026-14108

Indicators of Compromise

Chrome renderer process crashes referencing pdfium.dll, libpdfium.so, or PDFium symbols in crash telemetry
Unexpected child processes spawned from chrome.exe shortly after PDF rendering activity
Outbound network connections initiated by the renderer to untrusted hosts after a PDF is opened
PDF files delivered via email or download with unusually large or malformed object streams

Detection Strategies

Monitor endpoint telemetry for Chrome renderer crashes correlated with PDF file access events
Inspect proxy and email gateway logs for PDF downloads from newly registered or low-reputation domains
Apply YARA rules targeting known PDFium exploitation patterns such as heap-spray JavaScript inside PDF streams
Correlate browser process anomalies with subsequent process creation events indicative of sandbox escape attempts

Monitoring Recommendations

Enforce Chrome version reporting through enterprise management to identify hosts running builds prior to 150.0.7871.47
Ingest Chrome crash reports and browser telemetry into a central SIEM for renderer fault analysis
Track PDF file execution paths and flag renderer processes writing to unexpected disk locations

How to Mitigate CVE-2026-14108

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints
Restart Chrome after updating to ensure the patched PDFium library is loaded into memory
Audit all Chromium-based browsers and applications in the environment for equivalent PDFium updates
Restrict PDF rendering from untrusted sources through email filtering and web content policies

Patch Information

Google addressed CVE-2026-14108 in the Stable channel release documented in the Google Chrome Desktop Update. Administrators should deploy Chrome 150.0.7871.47 or later through their standard software distribution mechanism.

Workarounds

Disable the built-in Chrome PDF viewer via the AlwaysOpenPdfExternally enterprise policy until patching completes
Route inbound PDF attachments through a sandboxed rendering service or content disarm and reconstruction gateway
Block PDF downloads from untrusted domains at the web proxy layer as an interim control

bash

# Enforce Chrome auto-update and disable in-browser PDF viewer via policy (Windows registry example)
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v AlwaysOpenPdfExternally /t REG_DWORD /d 1 /f
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f