External risk intelligence

Chrome Bluetooth Use After Free Leading to Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-79091

The vulnerability exists within the Bluetooth implementation of a web browser and requires specific social engineering involving a crafted HTML page. It is a client-side issue dependent on user interaction rather than an internet-facing service, gateway, or network-accessible appliance.

Use After Free

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 vulnerability in Chrome's Bluetooth handling could allow remote code execution if a user visits a malicious webpage. This could lead to unauthorized actions on affected devices. The main concern is confirming relevance and exposure to this type of threat.

  • Code execution via web browsing.
  • Matters if user interaction is a risk.
  • Confirm if your systems use this.

Attack Path

How an attacker could exploit the issue

An attacker could trick a user into visiting a malicious webpage. This page would exploit a flaw in the browser's Bluetooth handling, allowing the attacker to execute code on the user's device.

  • Requires user interaction.
  • Triggers through a crafted webpage.
  • Leads to arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

A use-after-free vulnerability in Chrome's Bluetooth handling could allow an attacker to execute arbitrary code outside the browser's sandbox when a user visits a specially crafted HTML page. This could impact the security and integrity of the user's system.

  • System and user data could be compromised.
  • Via a malicious HTML page with social engineering.
  • Arbitrary code execution outside the sandbox.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-world ownership of this vulnerability likely falls to teams managing endpoint security and application deployments, specifically those responsible for the Chrome browser and its user base. The immediate practical move is to identify all endpoints with the affected browser version, assess exposure through user interaction and potential reachability, and then determine the appropriate remediation strategy based on risk and available maintenance windows.

  • Endpoint security and application teams own this.
  • Verify browser reachability and user interaction risk.
  • Plan remediation based on assessed risk.

Supplementary metadata

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.

Frequently asked questions

What is Google Chrome's Bluetooth component?

Google Chrome is a web browser that includes features to interface with local Bluetooth devices, such as headphones or peripherals, directly from web pages. This component handles the communication layer between the browser's sandbox and your computer's Bluetooth hardware, allowing websites to request connections to supported devices.

What does a use-after-free vulnerability mean in CVE-2026-79091?

A use-after-free, classified as CWE-416, happens when software continues to use a pointer to a memory location after that memory has been cleared or released. In this CVE, the browser mistakenly attempts to access Bluetooth data that is no longer valid, which an attacker can manipulate to bypass security boundaries and run unauthorized code.

How is this Chrome Bluetooth flaw triggered?

An attacker triggers this vulnerability by social engineering a user into visiting a specially crafted HTML page. Simply having the browser installed or the Bluetooth radio turned on does not trigger the bug; the specific, malicious web content must be loaded and processed by the browser to initiate the improper memory access.

Is my device at risk based on Halo Surface Signal?

Halo Surface Signal indicates that this threat is very unlikely to be a standard network-based attack. Because the vulnerability is confined to the client-side browser and requires specific user interaction with a malicious page, it does not function like an internet-facing service or appliance that can be scanned or reached remotely without user action.

What should I do if I use Chrome on my Mac?

First, verify your browser version to see if it precedes 152.0.7977.65. If you are on an older version, prioritize updating your browser through the standard settings menu. Because this relies on web-based exploitation, focus your defensive efforts on ensuring all endpoint users are running the latest patched software provided by the vendor.

References