External risk intelligence

Google Chrome PDF Use After Free Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-110136

This vulnerability is a client-side issue within the Google Chrome browser's PDF processing engine. It requires a user to navigate to a crafted HTML page, meaning it is not a public-facing service, gateway, or internet-exposed appliance. Because it relies on client-side interaction rather than an internet-facing server deployment, the reachable surface in common network environments is effectively local.

Use After Free

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability in Google Chrome's PDF handling could allow attackers to execute malicious code on user devices through specially crafted web pages. This issue, rated as Critical by Chromium security, affects the browser's ability to process PDF documents securely. The main concern is confirming the relevance and exposure of this client-side vulnerability to our organization.

Browser PDF flaw allows remote code execution.
User interaction needed; not a direct network threat.
Assess user exposure and browser update status.

Attack Path

How an attacker could exploit the issue

An attacker could lure a user into visiting a malicious webpage. This webpage would contain specially crafted HTML designed to exploit a flaw in Chrome's PDF viewer. Successful exploitation could allow the attacker to execute arbitrary code on the user's system, potentially bypassing security boundaries.

Requires user to visit a malicious page.
Triggered by viewing a crafted HTML page.
Leads to arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, a remote attacker could execute arbitrary code outside the sandbox by luring a user to a crafted HTML page, potentially impacting system data and service behavior.

System data and user data could be affected.
Exposure may occur via a crafted HTML page.
Arbitrary code execution outside the sandbox.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in Chrome's PDF engine allows for arbitrary code execution. The immediate priority is for security teams to identify all Chrome instances, especially those used by employees interacting with external websites, and assess the business criticality of those instances. Following this, platform or endpoint teams should coordinate with vendor management to plan remediation, likely involving a browser update, considering user impact and maintenance windows.

Security and endpoint teams own remediation.
Verify user exposure to malicious sites.
Plan browser updates during maintenance windows.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Google Chrome and how does it handle PDF files?

Google Chrome is a widely used web browser that includes a built-in PDF viewer. This component allows users to open and interact with PDF documents directly within the browser tab without needing external software. The viewer is a core part of Chrome's engine, which processes various web data types to render the pages you see online.

What does CWE-416, the weakness in CVE-2026-110136, mean?

CWE-416 is known as Use After Free. It occurs when a program continues to use a piece of computer memory after that memory has been cleared or assigned to another task. In this specific vulnerability, the PDF engine handles memory incorrectly, which can allow an attacker to take control of the process and run their own unauthorized code on the user's computer.

How is this Chrome vulnerability triggered?

The issue is triggered when a user navigates to a specifically crafted HTML page that exploits the PDF engine. Crucially, the vulnerability does not trigger simply by having the browser installed or running in the background. It requires active user interaction, specifically visiting a malicious site that forces the browser to process the harmful PDF-related instructions.

Is this vulnerability an internet-facing threat?

According to Halo Surface Signal, this is a client-side issue rather than an internet-facing server service. Because it relies on a user visiting a malicious webpage, it is not a direct network-based attack against your infrastructure. The reachable surface is effectively limited to individual user devices, making it less of a typical network perimeter risk.

How do I respond to CVE-2026-110136?

Your first step is to verify the browser versions currently in use across your environment. Since this is a client-side vulnerability, remediation focuses on ensuring all endpoints are updated to the latest version of Google Chrome, which includes the necessary security patches. Prioritize updating devices used by employees who frequently browse external websites.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.