SSRF (Server-Side Request Forgery) in homeassistant (CVE-2026-91129)
Summary
SSRF in homeassistant (CVE-2026-91129). Risk of unauthorized operations or information disclosure. Exploitable via _ipp._tcp.local. Mitigation: upgrade to 2026.2.3 or later.
Original description
The description as published by the source.
Summary
Home Assistant Green is vulnerable to a Server-Side Request Forgery (SSRF) via the mDNS/Zeroconf IPP integration. An unauthenticated attacker on the local network can send a crafted mDNS response to trick Home Assistant into making HTTP requests to arbitrary hosts, including internal services bound to localhost. The IPP integration automatically processes _ipp._tcp.local service announcements without any user interaction or authentication, and follows HTTP redirects from the attacker-controlled host.
Details
Home Assistant listens for mDNS service announcements on port 5353. When a service of type _ipp._tcp.local is discovered, the IPP integration's zeroconf handler (homeassistant/components/ipp/config_flow.py) processes it automatically.
The async_step_zeroconf method extracts host, port, and base_path directly from the mDNS discovery info without validation:
async def async_step_zeroconf(
self, discovery_info: ZeroconfServiceInfo
) -> ConfigFlowResult:
host = discovery_info.host
port = discovery_info.port
zctype = discovery_info.type
name = discovery_info.name.replace(f".{zctype}", "")
tls = zctype == "_ipps._tcp.local."
base_path = discovery_info.properties.get("rp", "ipp/print")
self.discovery_info.update(
{
CONF_HOST: host,
CONF_PORT: port,
CONF_SSL: tls,
CONF_VERIFY_SSL: False,
CONF_BASE_PATH: f"/{base_path}",
CONF_N…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-91129 has been found in homeassistant.
Attackers can target a specific entry point like _ipp._tcp.local over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10.
What to do: upgrade homeassistant to 2026.2.3 or later.
If unsure, ask your IT team or search "homeassistant CVE-2026-91129" on the vendor's site.
CVE-2026-91129 (homeassistant) — CWE-918 / CVSS v3 5.4
Attack vector: adjacent-network / unauthenticated / no user interaction
Attack surface: _ipp._tcp.local / async_step_zeroconf / host / port
Patched: 2026.2.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
SSRF (CWE-918) exists in homeassistant. Attackers reach the vulnerable code path via _ipp._tcp.local without authentication.
Check the vendor advisory for the affected versions of homeassistant. Attack surface: _ipp._tcp.local / async_step_zeroconf / host / port.
Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure.
Update to 2026.2.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'homeassistant' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'homeassistant' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
homeassistantを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade homeassistant to 2026.2.3ステージング環境で 2026.2.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com