CVE-2026-126623

{
  "etk_id": "ETK-2026-4153",
  "cve_id": "CVE-2026-126623",
  "display_id": "CVE-2026-126623",
  "ghsa_id": "GHSA-gxm7-28h3-vf9j",
  "euvd_id": "EUVD-2026-123328",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Algorithmic-complexity denial of service in hMailServer JSON parsing",
  "summary": "hMailServer 6.3.6 and 6.3.7 can spend excessive CPU time parsing specially chosen JSON objects, allowing remote attackers to occupy mail-delivery or REST API workers and disrupt mail, webmail, or API availability. Unauthenticated exposure depends on configured TLS-RPT report mailboxes or on enabling the REST API with public password-protected-message links.",
  "mitigation": "Disable the REST API and public password-protected-message links where they are not required, and remove or isolate TLS-RPT report mailbox handling where operationally feasible. Restrict access to JSON-processing webmail and API routes and apply request-size or rate controls at a proxy; no fixed version is recorded in the advisory.",
  "vendor": "Progressive Robot Ltd",
  "product": "hMailServer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.3.6, <= 6.3.7"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "hMailServer",
      "purl": null
    }
  ],
  "cwes": [
    407
  ],
  "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:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 138.21308618333333,
  "t0_at": "2026-11-11T08:31:47.129000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-11T08:31:47.129000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-11T08:31:47.129000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-126623"
    }
  }
}