How severe is CVE-2026-3557?

CVE-2026-3557 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3557?

CVE-2026-3557 affects Philips Hue Bridge V2 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3557?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3557 have an EU (EUVD) identifier?

Yes. CVE-2026-3557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12158.

When was CVE-2026-3557 published?

CVE-2026-3557 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-3557

CVE-2026-3557 is a high-severity vulnerability in Philips Hue Bridge V2 Firmware with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12158
Weakness: CWE-122
Affected product: Philips Hue Bridge V2 Firmware
Published: 2026-03-16
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3557?: CVE-2026-3557 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3557?: CVE-2026-3557 affects Philips Hue Bridge V2 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3557?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3557 have an EU (EUVD) identifier?: Yes. CVE-2026-3557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12158.
When was CVE-2026-3557 published?: CVE-2026-3557 was published on 2026-03-16 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-26-155/

Affected products (1)

cpe:2.3:o:philips:hue_bridge_v2_firmware:*:*:*:*:*:*:*:*

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