CVE-2026-126621

{
  "etk_id": "ETK-2026-4160",
  "cve_id": "CVE-2026-126621",
  "display_id": "CVE-2026-126621",
  "ghsa_id": "GHSA-2q54-5c4c-vg9w",
  "euvd_id": "EUVD-2026-123337",
  "status": "in_pipeline",
  "anchor_state": "anchored",
  "title": "TLS filename encoding confusion in hMailServer",
  "summary": "Windows hMailServer 6.0.0-B1 through 6.3.7 can resolve certain non-ASCII TLS-related file names to an unintended file. A local attacker able to place files or directories at that alternate path may cause attacker-controlled TLS material to be used, enabling unauthorized certificate-based access, storage-connection interception, key disclosure, or TLS service disruption. The risk depends on affected non-default configuration and writable adjacent filesystem locations.",
  "mitigation": "On Windows, change all hMailServer TLS, client-certificate, object-store, and ACME file paths to ASCII-only names, and prevent untrusted local users from creating files or directories near those paths. Disable unused client-certificate authentication, object-store TLS, and ACME features until the paths and permissions have been reviewed.",
  "vendor": "Progressive Robot Ltd",
  "product": "hMailServer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.0.0-B1, <= 6.3.7"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "hMailServer",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": null,
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": null,
  "t0_at": "2026-11-11T08:36:26.283000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-11T08:36:26.283000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-11T08:36:26.283000+00:00",
      "url": "https://github.com/advisories/GHSA-2q54-5c4c-vg9w"
    }
  }
}