CVE-2026-116265

{
  "etk_id": "ETK-2026-2893",
  "cve_id": "CVE-2026-116265",
  "display_id": "CVE-2026-116265",
  "ghsa_id": "GHSA-7m3r-rg8x-jrmh",
  "euvd_id": "EUVD-2026-112297",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Multipart boundary validation flaw in MIME-tools",
  "summary": "MIME-tools versions before 5.521 do not reliably identify ambiguous RFC 2231 multipart boundaries. A remote sender may cause MIME::Parser and other mail readers to interpret message boundaries differently, potentially hiding an attachment from filters that rely on ambiguous_content().",
  "mitigation": "Upgrade MIME-tools to version 5.521 or later. Until upgraded, avoid relying solely on ambiguous_content() to validate multipart messages and apply additional attachment inspection controls.",
  "vendor": null,
  "product": "MIME-tools",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 5.521"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "5.521"
      ],
      "package_name": "MIME-tools",
      "purl": null
    }
  ],
  "cwes": [
    436
  ],
  "cvss_score": null,
  "cvss_src": null,
  "cvss_vector": null,
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 19.101864266666666,
  "t0_at": "2026-10-28T17:32:11.827000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-28T17:32:11.827000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-28T17:32:11.827000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-116265"
    }
  }
}