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CVE-2026-91129

📛 CVE Title

Home Assistant: mDNS Server-Side Request Forgery

⬇ Download JSON

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.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
MEDIUM
CVSS score
CVSS 5.4 / 10 5.4 5.4 / 10
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Effective score
5.4 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-918
Reserved
2026-09-14
Published
2026-09-22 19:05 UTC
Last updated
2026-09-22 19:05 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/91xxx/CVE-2026-91129.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-09-22 19:16:56 UTC
NVD last modified
2026-09-22 19:16:56 UTC
NVD CVSS v3.1
CVSS 5.4 / 10 5.4 5.4 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Exploitability subscore
2.8 / 10
Impact subscore
2.5 / 10

NVD / KEV / EPSS data refreshed 2026-09-23 02:33 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-84804
Assigner
GitHub_M
Published
Sep 22, 2026, 7:05:15 PM
Updated
Sep 22, 2026, 7:05:15 PM
EUVD base score (CVSS 3.1)
5.4 / 10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EUVD-reported EPSS
0.0000
Vendors
home-assistant
Products
core (< 2026.2.3)
Aliases
GHSA-4ghv-53cq-7wp3

ENISA 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.

EUVD references (5)

Affected products (1)
VendorProductVersionsPlatforms
home-assistant core < 2026.2.3 (affected) —

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (10)

  • Microsoft Patch Tuesday for September 2026 — Snort rules and prominent ...
    web:blog.talosintelligence.com

    Microsoft has released its monthly security update for September 2026 , which includes 973 vulnerabilities affecting a range of products, including 113 that Microsoft marked as "critical." Microsoft notes that 2 of the vulnerabilities disclosed this month have been exploited in the wild: CVE - 2026 -81963 affects Windows Update Stack. CVE - 2026 -81963 is a elevation of privilege vulnerability ...

    2026-09-23 15:41 UTC
  • CVE-2026-91129: Home-assistant Core Vulnerability | CVETodo
    web:cvetodo.com

    CVE-2026-91129 is a CVSS 5.4 medium-severity vulnerability in Core. Full technical analysis, mitigations , and exploit status — updated in real time.

    2026-09-23 15:41 UTC
  • Cisco Advance Notification for Publication of September 16, 2026 ...
    web:sec.cloudapps.cisco.com

    On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

    2026-09-23 15:41 UTC
  • Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva
    web:senserva.com

    Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

    2026-09-23 15:41 UTC
  • August 2026 CVE Advisory Notification - Security
    web:support.servicenow.com

    Due to additional analysis provided by the security researcher who discovered CVE - 2026 -6876, we have upgraded the severity rating of CVE - 2026 -6876 from High to Critical. This change affects only the severity

    2026-09-23 15:41 UTC
  • CVE-2026-20212: Critical Cisco Nexus 9000 RCE, CVSS 9.8 | The CyberSec Guru
    web:thecybersecguru.com

    CVE - 2026 -20212 is a critical CVSS 9.8 unauthenticated RCE affecting specific Cisco Nexus 9000 switches. Check affected models, NX-OS versions and fixes

    2026-09-23 15:41 UTC
  • September 2026 Patch Tuesday: CISO Executive Summary
    web:www.action1.com

    This CISO-focused summary highlights the vulnerabilities and critical infrastructure risks that should take priority for remediation following Microsoft's September 2026 Patch Tuesday release.

    2026-09-23 15:41 UTC
  • CVE-2026-91129: home-assistant core: Home Assistant is open ... - Rapid7
    web:www.rapid7.com

    CVE-2026-91129 : home-assistant core: Home Assistant is open source home automation software focused on local control and privacy. View severity, references, and remediation details from Rapid7.

    2026-09-23 15:41 UTC
  • CISA KEV September 16, 2026: Three CVE Patch Analysis
    web:www.secpod.com

    Patch Timeline & Exploitation Gap Analysis The September 16, 2026 dataset contains three CISA KEV vulnerabilities. Each record was added to the catalog on September 16, 2026 and assigned a remediation deadline of September 19, 2026 . Consequently, all three vulnerabilities have an identical three-calendar-day KEV inclusion-to- remediation window.

    2026-09-23 15:41 UTC
  • July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs - Tenable
    web:www.tenable.com

    Microsoft patched 569 CVEs in July 2026 , the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

    2026-09-23 15:41 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-91129.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "core",
          "vendor": "home-assistant",
          "versions": [
            {
              "status": "affected",
              "version": "< 2026.2.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T19:05:15.559Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3"
        },
        {
          "name": "https://github.com/home-assistant/core/pull/162941",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/home-assistant/core/pull/162941"
        },
        {
          "name": "https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560"
        },
        {
          "name": "https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3"
        },
        {
          "name": "https://github.com/home-assistant/core/releases/tag/2026.2.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/home-assistant/core/releases/tag/2026.2.3"
        }
      ],
      "source": {
        "advisory": "GHSA-4ghv-53cq-7wp3",
        "discovery": "UNKNOWN"
      },
      "title": "Home Assistant: mDNS Server-Side Request Forgery"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-91129",
    "datePublished": "2026-09-22T19:05:15.559Z",
    "dateReserved": "2026-09-14T19:36:48.844Z",
    "dateUpdated": "2026-09-22T19:05:15.559Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}