(Pwn2Own) Home Assistant Green aiohttp_client Server-Side Request Forgery Vulnerability

November 6th, 2026
ZDI-26-897 ZDI-CAN-28361

CVE ID

CVE-2026-91131

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 aiohttp_client module. The issue results from following HTTP redirects. 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/security/advisories/GHSA-6456-4qg9-cqpj

Disclosure Timeline

  • 2025-11-05 - Vulnerability reported to vendor
  • 2026-11-06 - Coordinated public release of advisory
  • 2026-11-06 - Advisory Updated

Credit

Team Neodyme (@Neodyme)

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