ETK-2026-3627Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3627",
  "cve_id": null,
  "display_id": "ETK-2026-3627",
  "ghsa_id": "GHSA-fhw2-mvqf-h69c",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "DMARC enforcement bypass in maddy",
  "summary": "maddy versions before 0.9.7 can treat failures while determining the author domain as a DMARC policy that requires no enforcement. An unauthenticated SMTP sender can use an invalid or ambiguous From header to bypass DMARC handling and deliver mail with a spoofed displayed author identity when inbound DMARC checking is enabled.",
  "mitigation": "Upgrade maddy to version 0.9.7 or later. Until upgrading, reduce exposure by restricting untrusted inbound SMTP where operationally possible and apply independent sender-validation controls.",
  "vendor": "go",
  "product": "go:github.com/foxcpp/maddy",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 0.9.6"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "0.9.7"
      ],
      "package_name": "github.com/foxcpp/maddy",
      "purl": "pkg:golang/github.com/foxcpp/maddy"
    }
  ],
  "cwes": [
    290
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 44.4152969,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-05T13:05:01+00:00",
      "days": -0.4037552409837963,
      "is_lower_bound": true,
      "measured_at": "2026-11-05T22:46:25.490901+00:00",
      "url": "https://github.com/foxcpp/maddy/security/advisories/GHSA-fhw2-mvqf-h69c"
    },
    "trigger_signal": {
      "at": "2026-11-05T13:05:01+00:00",
      "days": -0.4037552409837963,
      "is_lower_bound": true,
      "measured_at": "2026-11-05T22:46:25.490901+00:00",
      "url": "https://github.com/foxcpp/maddy/security/advisories/GHSA-fhw2-mvqf-h69c"
    }
  }
}