CVE-2026-91129 Home Assistant: mDNS Server-Side Request Forgery
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-91129?
CVE-2026-91129 is a medium-severity vulnerability in home-assistant core, published on 22 Sep 2026.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-91129?
3 open source packages ship an affected version, including homeassistant.
| Package | Affected | Fixed in |
|---|---|---|
homeassistant PyPI | All versions | 2026.2.3 |
homeassistant PyPI | All versions | 2026.2.3 |
homeassistant PyPI | All versions | 2026.2.3 |
How do I fix CVE-2026-91129?
Upgrade homeassistant to 2026.2.3 or later.
Is CVE-2026-91129 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91129 exists.
Sources
Also known as GHSA-4ghv-53cq-7wp3, PYSEC-2026-4051.