Advisory Details

March 6th, 2026

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

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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