External risk intelligence

Chrome DevTools Use After Free Leads to Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-85042

The vulnerability exists in a web browser's DevTools, which is a client-side component. While it requires user interaction to visit a crafted HTML page, web browsers are internet-facing applications that commonly process untrusted remote content, making exploitation via the public internet a primary deployment risk.

Use After Free

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 critical vulnerability has been identified in Google Chrome's developer tools that could allow a remote attacker to execute arbitrary code outside the browser's security sandbox. This means that if a user visits a malicious webpage, an attacker might be able to compromise their system. The main concern is to confirm if our organization uses affected versions of Chrome and is potentially exposed to this risk.

A flaw in Chrome's developer tools is concerning.
It could allow attackers to run unauthorized code.
Confirm exposure and evaluate relevance for our users.

Attack Path

How an attacker could exploit the issue

An attacker could entice a user to visit a malicious web page, which then interacts with Chrome's developer tools. This interaction could lead to a use-after-free vulnerability, potentially allowing the attacker to execute code on the user's system outside of Chrome's security sandbox.

Requires visiting a malicious page.
Triggers vulnerability in developer tools.
Risk of arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to execute arbitrary code outside the sandbox when a user visits a malicious HTML page. This could impact the confidentiality, integrity, and availability of the user's system when the browser is used to process untrusted content.

System code execution outside the sandbox.
Remote attacker via crafted HTML page.
Arbitrary code execution and system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Determining ownership for this vulnerability requires identifying which teams manage the Chrome browser deployments within your organization and confirming their exposure. Initial steps should focus on inventorying all Chrome installations, assessing their reachability from external networks, and identifying the business-critical systems they access to prioritize remediation efforts and engage the accountable owners.

Own by browser or endpoint management teams.
Verify browser reachability and critical asset access.
Plan remediation or risk reduction by owner.

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.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Google Chrome and how is DevTools used?

Google Chrome is a widely used web browser based on the Chromium engine. It includes a built-in suite of diagnostic features called DevTools. Developers and designers use these tools to inspect web page elements, debug JavaScript, and analyze network activity. While these tools are essential for web development, they run with browser-level permissions that can be targeted by security flaws.

What does a use-after-free vulnerability mean in CVE-2026-85042?

This flaw belongs to the Use After Free (CWE-416) weakness class. It occurs when a program continues to use a memory location after it has been cleared or deallocated. In this specific CVE, the browser's DevTools incorrectly manages memory, which a remote attacker can manipulate to inject and execute their own unauthorized code instead of legitimate program instructions.

How is this Chrome vulnerability triggered?

An attacker must successfully entice a user to navigate to a specifically crafted HTML page. Simply having the browser installed or running is not enough to trigger the bug. If the user does not visit the malicious site, the vulnerable code path within DevTools remains inactive and the system is not compromised.

Is my organization at risk from CVE-2026-85042?

Halo Surface Signal notes that because browsers are inherently internet-facing and process untrusted remote content, the risk of exploitation via the public web is high. If your users frequently access external websites, their browsers are potential vectors. Organizations should prioritize internal endpoints that are routinely exposed to the open internet.

What should I do if I use Chrome in my environment?

Start by identifying all managed Chrome installations within your organization to understand your footprint. Verify if your versions are older than 152.0.7977.82, as these are confirmed to be affected. Coordinate with the teams responsible for endpoint software management to roll out the latest browser updates provided by Google to all users.

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.