CVE-2026-91129

MEDIUM 5.4

Home Assistant: mDNS Server-Side Request Forgery

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

Home Assistant is open source home automation software focused on local control and privacy. Prior to 2026.2.3, the IPP integration automatically processed unauthenticated _ipp._tcp.local mDNS announcements in homeassistant/components/ipp/config_flow.py, where async_step_zeroconf passed attacker-controlled host, port, and base_path values to validate_input for printer metadata retrieval. Because the shared HTTP client followed attacker-controlled cross-origin redirects without blocking loopback targets, a local-network attacker could redirect the request to 127.0.0.1 or another internal service without user interaction or prior IPP configuration. This issue is fixed in version 2026.2.3.

CWE	CWE-918
Vendor	home-assistant
Product	core
Published	Sep 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

home-assistant / core

< 2026.2.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3 github.com: https://github.com/home-assistant/core/pull/162941 github.com: https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560 github.com: https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3 github.com: https://github.com/home-assistant/core/releases/tag/2026.2.3