(Pwn2Own) Philips Hue Bridge HomeKit Accessory Protocol chacha20_decrypt Integer Underflow Remote Code Execution Vulnerability

November 13th, 2026
ZDI-26-964 ZDI-CAN-28332

CVE ID

CVE-2026-126979

CVSS Score

8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Philips

Affected Products

Hue Bridge

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Philips Hue Bridge. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the HomeKit Accessory Protocol service, which listens on TCP port 8080 by default. When parsing pairing requests, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the device.

Additional Details

Fixed in Bridge v2 Software version 1975170000
https://www.philips-hue.com/en-ca/support/release-notes/bridge


Disclosure Timeline

  • 2026-07-28 - Vulnerability reported to vendor
  • 2026-11-13 - Coordinated public release of advisory
  • 2026-11-13 - Advisory Updated

Credit

Sang Nguyen Thien (@gnas0x0018) and mistsu of Team ANHTUD

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