External risk intelligence

Bluetooth Use-After-Free Vulnerability Allows Remote Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-55330

The vulnerability exists within the Bluetooth stack (BluetoothCccHandlerCallbackImpl). Bluetooth is a short-range, local-area wireless technology. It is not an internet-facing service or protocol, and standard deployments do not expose Bluetooth interfaces directly to the public internet.

Use After Free

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 critical vulnerability has been identified in the Bluetooth handling within certain technologies, potentially allowing for remote code execution without requiring any user interaction. This issue, stemming from a logic error, could present a significant security risk if exploited.

  • Flaw in Bluetooth code allows remote execution.
  • Potential for widespread compromise exists.
  • Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted Bluetooth packets to a target device. This could lead to remote code execution without requiring user interaction or elevated privileges.

  • Attackers need Bluetooth exposure.
  • Specially crafted packets trigger vulnerability.
  • Remote code execution risk.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability, when exploited, could allow an attacker to execute arbitrary code remotely on a vulnerable system without requiring user interaction or elevated privileges. The logic error in the Bluetooth code could lead to a use-after-free condition, potentially impacting the confidentiality, integrity, and availability of the affected system.

  • System code execution.
  • Exploited via network connection.
  • Remote code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical Bluetooth vulnerability, a use-after-free in the BluetoothCccHandlerCallbackImpl, could allow for remote code execution without user interaction. Given its network attack vector, initial triage should focus on identifying all Bluetooth-enabled assets, determining their exposure to external networks, and confirming ownership to prioritize remediation. Vendor coordination for affected platforms like Android may be necessary.

  • Platform or security teams should own this issue.
  • Verify Bluetooth services' external network exposure.
  • Plan remediation based on asset criticality.

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 the software component affected by CVE-2026-55330?

This vulnerability impacts the Bluetooth stack, specifically within the BluetoothCccHandlerCallbackImpl component. This part of the system manages Bluetooth Client Characteristic Configuration (CCC), which is essential for handling how devices communicate and exchange data over short-range wireless connections.

What does a use-after-free vulnerability mean in this context?

This vulnerability is classified as CWE-416, a use-after-free error. It occurs when the software continues to use a memory address after that memory has been cleared or deallocated. By exploiting this logic error, an attacker could manipulate the system into performing unauthorized actions, leading to the execution of malicious code.

How is this Bluetooth vulnerability triggered?

The flaw is triggered by an attacker sending specially crafted Bluetooth packets to a device. Importantly, the vulnerability does not require user interaction or elevated system privileges to occur. However, it requires the device to be within the proximity required for standard Bluetooth communication.

Is my device at risk based on Halo Surface Signal?

According to Halo Surface Signal, this risk is very unlikely for most systems. Because Bluetooth is a short-range, local-area wireless technology, it is not an internet-facing protocol. Standard device deployments do not expose Bluetooth interfaces directly to the public internet, which significantly limits remote reach.

What should I do if I manage devices with Bluetooth enabled?

Start by identifying all Bluetooth-enabled assets within your environment and confirming who owns them. Focus your efforts on verifying if any of these services are unintentionally exposed to external networks. Finally, coordinate with your device vendors to monitor for and apply official security updates.

References