External risk intelligence

Chrome Use After Free Vulnerability Allows Sandbox Escape

CVE advisorySeverity: HIGH (CVSS 8.8)

CVE-2026-15902

The vulnerability exists in Google Chrome, a web browser. Browsers are inherently designed to process untrusted content from the public internet, making the attack surface frequently exposed to web-based threats during normal operation.

Use After Free

Google Chrome

before 150.0.7871.128

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A use-after-free vulnerability in Google Chrome could allow an attacker to execute code on a user's device by directing them to a malicious webpage. The potential for arbitrary code execution, especially within a sandbox environment, warrants attention to understand its relevance to our organization.

Flaw in Chrome lets attackers run code.
It affects widely used web browsing.
Confirm if our systems use affected versions.

Attack Path

How an attacker could exploit the issue

An attacker can entice a user to visit a malicious webpage, which then triggers a use-after-free vulnerability in Chrome's Cast feature. Successful exploitation could allow an attacker to escape the browser's sandbox and execute arbitrary code.

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

Live Threat

Current exploitation, exposure, and threat context

A use-after-free vulnerability in Google Chrome could allow a remote attacker to execute arbitrary code within the browser's sandbox when a user visits a specially crafted HTML page. This could potentially affect the integrity and confidentiality of data processed by the browser.

Arbitrary code execution within the sandbox.
Via a malicious crafted HTML page.
Compromise of user session and data.

Operational Fix

Recommended remediation, mitigation, and detection steps

This "use after free" vulnerability in Google Chrome presents a critical risk, allowing remote code execution within a sandbox. Addressing this requires identifying all instances of the affected Chrome version, assessing their exposure and criticality, and coordinating with the appropriate teams – likely the platform or endpoint management team, in conjunction with security operations. The first practical step is to confirm the presence and reachability of vulnerable Chrome instances across the organization and then plan remediation based on the identified risk and business impact.

Platform or endpoint teams should own resolution.
Verify Chrome browser instances and reachability.
Coordinate updates during planned 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 function?

Google Chrome is a widely used web browser built on the Chromium engine. It acts as a primary interface for accessing internet content, managing web applications, and rendering HTML. It employs a sandbox architecture, a security mechanism that isolates browser processes to prevent malicious code from accessing the underlying operating system or other sensitive local files during normal browsing.

What does CWE-416 mean for CVE-2026-15902?

CWE-416 is the weakness classification for a Use After Free vulnerability. In this CVE, it occurs within the Cast feature of Chrome. It happens when the software continues to use a memory pointer after it has been cleared or freed. Because the memory is no longer correctly managed, an attacker can manipulate this state to execute arbitrary code rather than just causing the browser to crash.

How is the vulnerability triggered?

The flaw is triggered when a user visits a specifically crafted HTML page that interacts with the browser's Cast component. It is important to note that simply having the browser installed does not trigger the bug; it requires active user interaction, specifically navigating to malicious web content designed to exploit this memory management error.

Is my system relevant according to Halo Surface Signal?

According to Halo Surface Signal, this vulnerability is highly relevant because Google Chrome is inherently designed to fetch and process untrusted content from the public internet. Because the browser must interact with external sites constantly, the attack surface is frequently exposed during typical operation, making almost any system running the affected version a potential target.

When should I take action for CVE-2026-15902?

You should prioritize identifying all instances of the affected browser version within your environment immediately. Since this allows for code execution, the first practical step is to coordinate with your endpoint or platform management teams to verify which systems are running older versions. Planning and deploying the official update provided by the vendor is the standard path to remediate this risk.

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.