Heap-based Buffer Overflow in Philips Hue Bridge Zigbee Stack

CVE-2026-3555

What is CVE-2026-3555?

CVE-2026-3555 is a vulnerability identified in the Philips Hue Bridge, which is a smart home device responsible for managing Philips Hue smart lighting systems. This particular flaw resides in the implementation of the Zigbee stack, specifically within the handling of custom command frames during the model information download process. The issue results from inadequate validation of data size before it is copied to a fixed-size heap buffer. Consequently, this vulnerability allows network-adjacent attackers to execute arbitrary code on the device. Successful exploitation requires user interaction, as an attacker would need the user to start the device pairing process. Given the nature of smart home devices and their integration into personal and commercial environments, this vulnerability poses significant risks to users, exposing them to potential unauthorized access and control over their smart lighting systems.

Potential Impact of CVE-2026-3555

1. Remote Code Execution: The vulnerability allows attackers to execute arbitrary code on the affected device. This capability can lead to unauthorized control over the Philips Hue Bridge, enabling adversaries to manipulate connected smart lighting systems.

2. User Data Exposure: If compromised, attackers may gain access to sensitive information related to user interactions and preferences within the smart home environment, potentially leading to broader privacy concerns.

3. Gateway to Larger Network Attacks: As smart home devices often serve as entry points into broader home or business networks, successful exploitation of this vulnerability could lead to further attacks on other connected devices, increasing the risk of a widespread security breach.

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