ETK-2026-4001Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-4001",
  "cve_id": null,
  "display_id": "ETK-2026-4001",
  "ghsa_id": "GHSA-2fgf-m8q4-c4fm",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Regular expression denial of service in mail-mime-parser",
  "summary": "mail-mime-parser may use excessive CPU when decoding specially formed MIME header values. An unauthenticated sender can delay mail processing by submitting a message with oversized reassembled RFC 2231 parameters, if the application parses untrusted mail and accesses header parameters.",
  "mitigation": "Upgrade mail-mime-parser to 3.0.10, 4.0.9 or later.",
  "vendor": "composer",
  "product": "composer:mail-mime-parser",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0, <= 4.0.8",
        ">= 3.0.0, <= 3.0.9"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "3.0.10",
        "4.0.9"
      ],
      "package_name": "mail-mime-parser",
      "purl": "pkg:composer/mail-mime-parser"
    }
  ],
  "cwes": [
    1333
  ],
  "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": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 9.926981266666667,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-11-09T21:55:50+00:00",
      "days": -1.1093754546180556,
      "is_lower_bound": true,
      "measured_at": "2026-11-11T00:33:20.096283+00:00",
      "url": "https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-2fgf-m8q4-c4fm"
    }
  }
}