Home Assistant: mDNS Server-Side Request Forgery

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-91129
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-22 19:16:56 UTC
Updated2026-09-22 19:16:56 UTC
DescriptionHome 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Home-assistant Core affected < 2026.2.3 Not specified

References

ReferenceSourceLinkTags
github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3 [email protected] github.com
github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea... [email protected] github.com
github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e48... [email protected] github.com
github.com/home-assistant/core/pull/162941 [email protected] github.com
github.com/home-assistant/core/releases/tag/2026.2.3 [email protected] github.com
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