(Pwn2Own) Philips Hue Bridge hk_hap Ed25519 Signature Verification Authentication Bypass Vulnerability

March 6th, 2026
ZDI-26-160 ZDI-CAN-28480

CVE ID

CVE-2026-3562

CVSS Score

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

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 ed25519_sign_open function. The issue results from improper verification of a cryptographic signature. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

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


Disclosure Timeline

  • 2025-11-18 - Vulnerability reported to vendor
  • 2026-03-06 - Coordinated public release of advisory
  • 2026-03-06 - Advisory Updated

Credit

Viettel Cyber Security

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