CVE-2026-14404 Overview
CVE-2026-14404 is an inappropriate implementation vulnerability in PDFium, the PDF rendering engine embedded in Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.46 and allows a remote attacker to perform user interface (UI) spoofing through a crafted PDF file. The issue is tracked under [CWE-451] (User Interface Misrepresentation of Critical Information) and carries a Chromium security severity rating of Medium.
Exploitation requires user interaction, such as opening a malicious PDF served from an attacker-controlled resource. Successful attacks let adversaries misrepresent UI elements, which can support phishing and content-spoofing campaigns targeting Chrome users.
Critical Impact
A crafted PDF can manipulate the Chrome PDFium viewer interface to deceive users, enabling phishing and social engineering against high-integrity trust decisions.
Affected Products
- Google Chrome desktop versions prior to 150.0.7871.46
- PDFium component embedded in affected Chrome builds
- Chromium-based browsers that ship the vulnerable PDFium version
Discovery Timeline
- 2026-07-01 - CVE-2026-14404 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-14404
Vulnerability Analysis
The vulnerability resides in PDFium, the open-source PDF renderer that Chrome uses to display PDF content in-browser. PDFium implements rendering logic for interactive PDF elements, including annotations, forms, and navigation controls surfaced through the Chrome viewer chrome.
The inappropriate implementation permits a crafted PDF document to influence how UI elements render within the viewer. An attacker can present visual content that misrepresents the origin, security state, or intent of on-screen elements. The classification under [CWE-451] indicates the flaw affects how critical information is displayed to the user rather than corrupting memory or executing code.
Because the attack requires only that a victim open a malicious PDF, delivery is straightforward through email attachments, drive-by download pages, or embedded links in trusted-looking documents.
Root Cause
The root cause is inappropriate implementation logic in PDFium's handling of PDF content elements. The renderer does not enforce sufficient constraints on how document-supplied content interacts with viewer UI, allowing crafted PDFs to project misleading visual state.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker hosts or distributes a malicious PDF, and the victim opens it in a vulnerable Chrome build. Once rendered, the crafted PDF spoofs UI elements to mislead the user into trusting attacker-controlled content. No authentication is required, and the attack targets integrity by manipulating what the user perceives.
No verified public exploitation code is available. Technical detail is tracked in the Chromium Issue Tracker Entry and the Google Chrome Update Announcement.
Detection Methods for CVE-2026-14404
Indicators of Compromise
- Inbound PDF attachments or downloads from untrusted senders that render unusual overlays, dialogs, or navigation elements in the Chrome PDF viewer.
- Chrome browser telemetry showing PDF documents loaded from newly registered or low-reputation domains preceding user credential submissions.
- User reports of Chrome PDF viewer prompts that appear inconsistent with expected browser chrome or origin indicators.
Detection Strategies
- Inspect endpoint browser telemetry for Chrome versions below 150.0.7871.46 still handling inbound PDF content.
- Correlate PDF file downloads with subsequent outbound connections to credential-harvesting or attacker-controlled infrastructure.
- Apply YARA or content-inspection rules on email and web gateways to flag PDFs containing anomalous JavaScript, annotation, or form structures.
Monitoring Recommendations
- Track Chrome version distribution across managed endpoints and alert on hosts running builds prior to 150.0.7871.46.
- Monitor for PDF documents delivered through phishing-adjacent channels, including newly observed domains and unusual attachment naming patterns.
- Enable browser enterprise reporting to surface PDF rendering activity and user interaction events for post-incident analysis.
How to Mitigate CVE-2026-14404
Immediate Actions Required
- Update Google Chrome to version 150.0.7871.46 or later on all managed endpoints.
- Force restart of Chrome processes after deployment to ensure the patched PDFium binary is loaded.
- Audit Chromium-based browsers in the environment and apply vendor updates that include the fixed PDFium version.
Patch Information
Google addressed CVE-2026-14404 in the Chrome Stable Channel update to 150.0.7871.46. Deployment details are documented in the Google Chrome Update Announcement. Enterprises using managed Chrome deployments should push the update through group policy, MDM, or the Chrome Browser Cloud Management console.
Workarounds
- Configure Chrome enterprise policy to open PDFs in an external, patched PDF viewer rather than the built-in PDFium viewer.
- Block PDF attachments from untrusted external senders at the email gateway until patches are fully deployed.
- Train users to treat unexpected in-browser PDF prompts as suspicious and to verify origins through the address bar rather than in-document UI.
# Configuration example: enforce Chrome auto-update and disable in-browser PDF rendering via enterprise policy (Windows registry)
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v AlwaysOpenPdfExternally /t REG_DWORD /d 1 /f
reg add "HKLM\SOFTWARE\Policies\Google\Update\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v UpdateDefault /t REG_DWORD /d 1 /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
