VulnerabilityPublished 12 Aug 2026

ZDI-26-562: (Pwn2Own) Home Assistant Green mDNS Server-Side Request Forgery Vulnerability

Source Zero Day Initiative

Severity

Medium

Rated Medium by Zero Day Initiative

Data as of 21 Aug 2026, 17:34 UTC

What to do

AI-suggested

Home Assistant has released an update that corrects this vulnerability. Users should apply the official update from Home Assistant to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.

Description

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 ZDI has assigned a CVSS rating of 5.4.

Impact

Exploitation allows an attacker on the same network segment to make arbitrary server-side requests on the affected Home Assistant Green installation without authentication. This can lead to information disclosure and, when combined with other vulnerabilities, may result in arbitrary code execution as root.

Summary

The Home Assistant Green product contains a server-side request forgery vulnerability in its mDNS service. Network-adjacent attackers can exploit this flaw without authentication by sending crafted requests that bypass URI validation, enabling arbitrary server-side requests. This vulnerability can be chained with other flaws to achieve arbitrary code execution with root privileges. The vendor has issued an update to fix this vulnerability, as detailed in the referenced GitHub pull request.

References

zerodayinitiative.com/advisories/ZDI-26-562/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 12 Aug 2026, 20:10 UTC

References

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