CVE-2026-91129Public exploitHinoki check available

Internal service access via loopback redirects

Published Sep 22, 2026 · Updated Sep 22, 2026

Server-side request forgery in Home Assistant Core before 2026.2.3 allows remote attackers to reach loopback services via mDNS. The IPP zeroconf handler passes mDNS-supplied host, port, and path values into printer metadata retrieval, and the shared HTTP client follows cross-origin redirects to loopback targets. Access to the local network is required, but neither authentication, user interaction, nor prior IPP configuration is needed to make requests to otherwise unreachable internal services.

CVSS severity5.4
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Server-side request forgery in Home Assistant Core before 2026.2.3 allows remote attackers to reach loopback services via mDNS. The IPP zeroconf handler passes mDNS-supplied host, port, and path values into printer metadata retrieval, and the shared HTTP client follows cross-origin redirects to loopback targets. Access to the local network is required, but neither authentication, user interaction, nor prior IPP configuration is needed to make requests to otherwise unreachable internal services.

The record

CVE
CVE-2026-91129
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-918
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.2.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=< 2026.2.3

Published CVSS scores

5.4GitHub CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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