External risk intelligence

ANGLE Buffer Overflow in Chrome Allows Remote Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-121249

The vulnerability exists within the browser's graphics engine and requires a user to navigate to a specifically crafted HTML page to be triggered. As a client-side application component that is not a network-facing service, listener, or gateway, it lacks the characteristics of an internet-facing attack surface in common deployment scenarios.

Buffer Overflow

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 has been identified in the ANGLE component within Google Chrome, potentially allowing remote attackers to execute code outside the browser's sandbox by tricking users into visiting a malicious webpage. This issue carries a high severity rating, indicating a significant risk if exploited.

A flaw could allow code execution from malicious websites.
High severity; confirms browser software risk.
Assess exposure and confirm if relevant.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by directing a user to a specially crafted HTML page. This page would trigger a buffer overflow within the ANGLE graphics component of Google Chrome. Successful exploitation allows the attacker to execute arbitrary code outside the browser's sandbox, potentially leading to broader system compromise.

Requires user interaction.
Triggered by visiting a crafted HTML page.
Arbitrary code execution outside sandbox.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow a remote attacker to execute arbitrary code outside the sandbox when a user visits a specially crafted HTML page in a vulnerable version of Google Chrome. This could lead to the compromise of the user's session and potentially their system.

Browser sandbox escape.
User visits malicious HTML page.
Arbitrary code execution in browser.

Operational Fix

Recommended remediation, mitigation, and detection steps

ANGLE's buffer overflow in Google Chrome, enabling remote code execution via crafted HTML, impacts client-side applications. Security and platform teams should collaborate to identify affected browsers, confirm business criticality, and prioritize remediation based on exposure.

Browser owners to identify deployments.
Verify user exposure to malicious sites.
Plan controlled updates or vendor coordination.

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 the ANGLE component in Google Chrome?

ANGLE is a graphics abstraction layer used by Chrome to translate web-based graphics calls into instructions that your computer's hardware, like your graphics card, can understand. It helps ensure that rendering content like 3D animations or complex web layouts remains consistent across different operating systems.

What does this CVE-2026-121249 buffer overflow mean?

This vulnerability is classified as a stack-based buffer overflow (CWE-121). In plain terms, it means the ANGLE component attempts to write more data into a temporary storage space than it can hold. Because this happens in the graphics engine, an attacker can use this mistake to overwrite adjacent memory, potentially forcing the software to run unauthorized code.

How is this vulnerability triggered?

The vulnerability requires a user to navigate to a specifically crafted HTML page. The trigger occurs when the browser attempts to process the malicious graphics instructions embedded in that page. Notably, simply having Chrome installed or running in the background does not trigger the flaw; it requires active interaction with the malicious content.

Is my system at high risk from this Chrome vulnerability?

According to Halo Surface Signal, this is unlikely to be a direct target for typical network-based attacks. Because Chrome is a client-side application rather than an internet-facing server or gateway, it does not provide an open port for remote intrusion. Your primary risk comes from navigating to untrusted websites that specifically target this flaw.

How should I respond to this security update?

If you are running a version of Chrome older than 157.0.8103.38, your first step is to update the application to the latest stable version provided by Google. Since this is a browser-level issue, ensuring your automatic updates are enabled is the most effective way to receive and apply the fix.

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.