External risk intelligence

Chrome WebGL Buffer Overflow Allows Remote Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-78948

This vulnerability affects WebGL in a web browser, requiring a user to visit a crafted HTML page. It is client-side software rather than an internet-facing service, appliance, or infrastructure component that would be directly exposed to public network scanning or unauthorized access.

Buffer Overflow

Google Chrome

before 152.0.7977.65

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 security vulnerability in Google Chrome's WebGL component could allow an attacker to execute code on a user's device by tricking them into visiting a malicious webpage. This type of issue is concerning because it impacts a widely used application and could potentially lead to unauthorized code execution.

Browser code execution flaw in WebGL.
Affects widely used Google Chrome software.
Confirm relevance and user exposure.

Attack Path

How an attacker could exploit the issue

An attacker could entice a user to visit a malicious website. This website would contain specially crafted code that targets a buffer overflow vulnerability within the WebGL component of the Chrome browser. If successful, this could allow the attacker to execute code on the user's machine, potentially escaping the browser's security sandbox.

Attacker entices user to visit a crafted website.
Vulnerable WebGL component in browser is triggered.
Risk of arbitrary code execution outside sandbox.

Live Threat

Current exploitation, exposure, and threat context

A buffer overflow in WebGL, when supported by the advisory, could allow a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. This could affect the user's system or sensitive information when a user visits a malicious website.

User's system or data.
Visiting a malicious HTML page.
Arbitrary code execution outside sandbox.

Operational Fix

Recommended remediation, mitigation, and detection steps

In a real-world scenario, the Platform Engineering team or End-User Computing team is typically responsible for managing browser deployments and updates, while Security Operations would focus on identifying and responding to exploitation attempts. The first practical step involves confirming the extent of Chrome usage across the organization, prioritizing critical assets or user groups, and coordinating with the vendor for patching.

Browser owner accountable for remediation.
Verify Chrome version deployment reach.
Plan controlled update deployment.

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 the WebGL component?

Google Chrome is a widely used web browser that renders web content. Its WebGL component is a specific software feature designed to allow the browser to display interactive 2D and 3D graphics. Because WebGL provides high-performance rendering capabilities, it is frequently used by websites for games, data visualizations, and complex user interfaces.

What does this CVE-2026-78948 buffer overflow mean?

This vulnerability is classified as a heap-based buffer overflow (CWE-122). It occurs when the WebGL component handles data incorrectly, writing more information than a memory buffer can hold. By triggering this weakness, an attacker can manipulate the browser's internal operations to run unauthorized code on the host device, effectively bypassing the security sandbox intended to isolate the browser from the rest of the system.

How is this Chrome vulnerability triggered?

The flaw is triggered when a user visits a malicious website containing specially crafted HTML content. The attacker cannot exploit this by simply knowing your IP address or scanning your network. It requires the user to interact with the malicious page directly in a vulnerable version of the browser. Visiting safe, trusted websites does not activate this bug.

Is this Chrome vulnerability a major threat to my infrastructure?

According to Halo Surface Signal, this is considered very unlikely to pose a direct threat to infrastructure because it is a client-side browser issue rather than an internet-facing service or server-side component. Since exploitation requires user interaction to visit a specific webpage, it does not typically expose servers or internal appliances to direct, automated remote attacks from the internet.

Do I need to update Chrome to address CVE-2026-78948?

Yes. The first step is to identify where Google Chrome is installed across your systems. You should verify if you are running a version earlier than 152.0.7977.65. If you are, prioritize updating to this version or newer to resolve the vulnerability. Coordinate with the team responsible for managing desktop software to ensure the update is applied consistently to all affected devices.

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.