---
id: CVE-2026-91129
title: >-
  Home Assistant is open source home automation software focused on local
  control and privacy
summary: >-
  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/ip…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-918
vendor: home-assistant
product: core
affected:
  - core < 2026.2.3
patched:
  - homeassistant 2026.2.3
published: '2026-09-22'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:14.223'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91129'
references:
  - url: >-
      https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560
    label: security-advisories@github.com
  - url: >-
      https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3
    label: security-advisories@github.com
  - url: 'https://github.com/home-assistant/core/pull/162941'
    label: security-advisories@github.com
  - url: 'https://github.com/home-assistant/core/releases/tag/2026.2.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3
    label: security-advisories@github.com
  - url: >-
      https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-4ghv-53cq-7wp3'
  - url: 'https://github.com/home-assistant/core'
tags:
  - nvd
  - cve.org
  - ghsa
  - pip
  - osv
  - exploit-available
epss: 0.00296
epssPercentile: 0.22528
aliases:
  - GHSA-4ghv-53cq-7wp3
ecosystem: pip
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-24T15:24:54.228110Z'
ingestedAt: '2026-09-22T20:10:15.091Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-91129)

Affected packages:

- `homeassistant < 2026.2.2`

Patched in:

- `homeassistant 2026.2.3`

Source: https://github.com/advisories/GHSA-4ghv-53cq-7wp3