CVE-2026-103604

{
  "etk_id": "ETK-2026-329",
  "cve_id": "CVE-2026-103604",
  "display_id": "CVE-2026-103604",
  "ghsa_id": "GHSA-p48w-99f8-9598",
  "euvd_id": "EUVD-2026-91234",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Quadratic X.509 name processing in bc-csharp",
  "summary": "bc-csharp versions before 2.7.0 can consume excessive CPU while formatting or comparing X.509 distinguished names. An unauthenticated remote party may cause a denial of service by supplying certificate-related data that the application subsequently renders, logs, displays, or compares.",
  "mitigation": "Upgrade bc-csharp to version 2.7.0 or later. Until upgraded, reduce exposure by avoiding string conversion or comparison of distinguished names from untrusted certificate-related inputs where practical.",
  "vendor": "Legion of the Bouncy Castle Inc.",
  "product": "bc-csharp",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 2.7.0"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2.7.0"
      ],
      "package_name": "BouncyCastle.Cryptography",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
  "epss_score": 0.0026,
  "epss_percentile": 0.1648,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 13.204829116666668,
  "t0_at": "2026-10-02T07:11:04.012000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-02T11:24:12.063003+00:00",
      "days": 0.17578762734953704,
      "is_lower_bound": false,
      "measured_at": "2026-10-02T07:11:04.012000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-02T07:11:04.012000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-02T07:11:04.012000+00:00",
      "url": "https://github.com/advisories/GHSA-p48w-99f8-9598"
    }
  }
}