# CVE-2026-3562: Philips Hue Bridge hk_hap Ed25519 Signature Verification Authentication Bypass Vulnerability

> Network-adjacent attackers can bypass authentication and execute arbitrary code on Philips Hue Bridge devices due to improper Ed25519 signature verification.

- **Severity:** Medium 6.3 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Mar 2026
- **Updated:** 16 Mar 2026
- **Also known as:** GHSA-6wwq-69q4-fc36

## What is CVE-2026-3562?

CVE-2026-3562 is a medium-severity authentication bypass vulnerability in Philips Hue Bridge, published on 13 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Philips Hue Bridge hk_hap Ed25519 Signature Verification Authentication Bypass Vulnerability. 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. Was ZDI-CAN-28480.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2026-3562?

It affects 1 product.


Products: Philips Hue Bridge V2 Firmware.

## How do I fix CVE-2026-3562?

No fix has been published for CVE-2026-3562 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3562 being exploited?

There is no known exploitation of CVE-2026-3562 in the wild and no public exploit code.

## Other vulnerabilities in Philips Hue Bridge

- [CVE-2026-3556](https://insights.sbomify.com/CVE-2026-3556/): Philips Hue Bridge HomeKit Pair-Setup Heap-based Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-3560](https://insights.sbomify.com/CVE-2026-3560/): Philips Hue Bridge HomeKit hk_hap_pair_storage_put Heap-based Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-3558](https://insights.sbomify.com/CVE-2026-3558/): Philips Hue Bridge HomeKit Accessory Protocol Transient Pairing Mode Authentication Bypass Vulnerability (high 8.1)
- [CVE-2026-3559](https://insights.sbomify.com/CVE-2026-3559/): Philips Hue Bridge HomeKit Accessory Protocol Static Nonce Authentication Bypass Vulnerability (high 8.1)
- [CVE-2026-3555](https://insights.sbomify.com/CVE-2026-3555/): Philips Hue Bridge Zigbee Stack Custom Command Handler Heap-based Buffer Overflow Remote Code Execution Vulnerability (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3562 and fix it if it is affected.

What it is: CVE-2026-3562 is a medium-severity authentication bypass vulnerability in Philips Hue Bridge, published on 13 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3562 in the wild and no public exploit code.

Affected product: Philips Hue Bridge. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3562/ (Markdown: https://insights.sbomify.com/CVE-2026-3562/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3562
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3562
- OSV: https://osv.dev/vulnerability/CVE-2026-3562

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3562/
Summaries are generated and may contain mistakes; the official description above is the record.