Home Assistant: mDNS Server-Side Request Forgery (CVE-2026-91129) | HOL Guard CVE

Medium · CVSS 5.4CVE-2026-91129GHSA-4GHV-53CQ-7WP3

Home Assistant: mDNS Server-Side Request Forgery

Answer in brief

CVE-2026-91129 records a Medium severity (CVSS 5.4) vulnerability in Home Assistant: mDNS Server-Side Request Forgery. The current sources do not mark it as known exploited. The current feed maps home-assistant/core (generic), homeassistant (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps home-assistant/core (generic), homeassistant (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
home-assistant/coregeneric	<2026.2.3	2026.2.3
homeassistantpip	<2026.2.2	2026.2.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for home-assistant/core, homeassistant.
Review the reported fix. Update home-assistant/core to 2026.2.3; homeassistant to 2026.2.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.