Buffer overflow in Philips Hue Bridge
CVE-2026-3557
Philips Hue Bridge hap_pair_verify_handler Sub-TLV Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Philips Hue Bridge. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the hap_pair_verify_handler function of the hk_hap service, which listens on TCP port 8080 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-28337.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Philips Hue Bridge — versions 1.73.1973146020
- Philips Hue Bridge V2
- Philips Hue Bridge V2 Firmware
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-155/ (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-3557?
- CVE-2026-3557 is a high-severity vulnerability in Philips Hue Bridge, classified under Heap-based Buffer Overflow. CVSS score: 8.0/10. Published 2026-03-16.
- How severe is CVE-2026-3557?
- High severity. CVSS v3 base score is 8.0 out of 10.