SSRF in Home-Assistant Core
CVE-2026-91129
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Home-Assistant Core — versions < 2026.2.3
Weakness classification (CWE)
References
- github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560
- github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3
- github.com/home-assistant/core/pull/162941
- github.com/home-assistant/core/releases/tag/2026.2.3
- github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3
Frequently asked questions
- What is CVE-2026-91129?
- CVE-2026-91129 is a medium-severity vulnerability in Home-Assistant Core, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-09-22.
- How severe is CVE-2026-91129?
- Medium severity. CVSS v3 base score is 5.4 out of 10.