(Pwn2Own) Home Assistant Green Simple Service Discovery Protocol Server-Side Request Forgery Vulnerability

August 12th, 2026
ZDI-26-563 ZDI-CAN-28279

CVE ID

CVSS Score

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

Affected Vendors

Home Assistant

Affected Products

Green

Vulnerability Details

This vulnerability allows network-adjacent attackers to initiate arbitrary server-side requests on affected installations of Home Assistant Green. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of SSDP headers. The issue results from the lack of proper validation of a URI prior to accessing resources. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

Additional Details

Home Assistant has issued an update to correct this vulnerability. More details can be found at:
https://github.com/home-assistant/core/pull/156622

Disclosure Timeline

  • 2025-11-05 - Vulnerability reported to vendor
  • 2026-08-12 - Coordinated public release of advisory
  • 2026-08-12 - Advisory Updated

Credit

Stephen Fewer (Rapid7)

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