What’s Vulnerable › Vulnerabilities

CVE-2026-91129: Home Assistant: mDNS Server-Side Request Forgery

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-25
• Weakness: CWE-918

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.

Affected products

• home-assistant core: before 2026.2.3

References

• https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560
• https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3
• https://github.com/home-assistant/core/pull/162941
• https://github.com/home-assistant/core/releases/tag/2026.2.3
• https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3
• https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3

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