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Advisory record · GHSA-4ghv-53cq-7wp3

Home Assistant: mDNS Server-Side Request Forgery

CVSS 5.4 MediumEPSS 0.0029 · 22nd percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
homeassistantPyPI<2026.2.32026.2.3
Identifiers
GHSA-4ghv-53cq-7wp3 · CVE-2026-91129 · PYSEC-2026-4051
Weakness (CWE)
CWE-918
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Home Assistant versions before 2026.2.3 are vulnerable to a server-side request forgery through the IPP integration's automatic mDNS discovery of _ipp._tcp.local services. An unauthenticated attacker on the same local network can send a crafted mDNS response that makes Home Assistant send HTTP requests, including redirected requests, to arbitrary hosts such as localhost-bound internal services. Upgrade to Home Assistant 2026.2.3 or later, which blocks redirects from non-loopback hosts to loopback addresses.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.4 Medium 3.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0029, the 22nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.