CVE-2026-104704

{
  "etk_id": "ETK-2026-1047",
  "cve_id": "CVE-2026-104704",
  "display_id": "CVE-2026-104704",
  "ghsa_id": "GHSA-gv77-q2r2-h9qj",
  "euvd_id": "EUVD-2026-94831",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Outbound SMTP TLS downgrade in hMailServer",
  "summary": "hMailServer 6.0.0 through 6.3.5 can fail to require TLS for outbound SMTP delivery when a recipient's DNSSEC-validated TLSA records lack a usable DANE-EE entry. An attacker able to interfere with the connection to the recipient mail server may cause unencrypted delivery and potentially observe or alter message contents.",
  "mitigation": "Upgrade hMailServer to version 6.3.6. Until upgraded, reduce exposure by restricting untrusted network-path access to outbound SMTP traffic.",
  "vendor": "Progressive Robot Ltd",
  "product": "hMailServer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.0.0, < 6.3.6"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "6.3.6"
      ],
      "package_name": "hMailServer",
      "purl": null
    }
  ],
  "cwes": [
    319
  ],
  "cvss_score": 7.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.0015,
  "epss_percentile": 0.038,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 26.066345983333335,
  "t0_at": "2026-10-08T10:52:40.630000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-08T10:52:40.630000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T10:52:40.630000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-104704"
    }
  }
}