CVE-2026-91129

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 22, 2026

Advisory Details (5)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

2026.2.3

Patch available: home-assistant/core 2026.2.3

https://github.com/home-assistant/core/releases/tag/2026.2.3
github_commit Patch Available

commit 815c708d19aa (home-assistant/core)

Patch available: home-assistant/core 2026.7.0 (contains commit 815c708d19aa)

https://github.com/home-assistant/core/commit/815c708d19aa0c7f59f9ee318b613a5e481a42b3
github_commit Patch Available

commit 0f3c7ca2772b (home-assistant/core)

Patch available: home-assistant/core 2026.7.0 (contains commit 0f3c7ca2772b)

https://github.com/home-assistant/core/commit/0f3c7ca2772b605c0f3c09c88f35e527ea6ea560
github_pr Patch Available

Block redirect to localhost

Patch available: home-assistant/core 2026.7.0 (PR #162941 merged 2026-02-13)

https://github.com/home-assistant/core/pull/162941
github Patch Available🟡 PoC Available

mDNS Server-Side Request Forgery · Advisory · home-assistant/core · GitHub

https://github.com/home-assistant/core/security/advisories/GHSA-4ghv-53cq-7wp3

Vendor Advisories for CVE-2026-91129(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-23 19:06 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescore
  3. 2026-09-22 19:37 UTCEG score recompute
  4. 2026-09-22 19:08 UTCEG score recompute
  5. 2026-09-22 19:08 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91129?
CVE-2026-91129 is a medium vulnerability published on September 22, 2026. 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/configflow.py, where asyncstepzeroconf passed…
When was CVE-2026-91129 disclosed?
CVE-2026-91129 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91129 actively exploited?
CVE-2026-91129 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-91129?
CVE-2026-91129 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-91129?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91129, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-91129

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