CVE-2026-128338

{
  "etk_id": "ETK-2026-4370",
  "cve_id": "CVE-2026-128338",
  "display_id": "CVE-2026-128338",
  "ghsa_id": "GHSA-6p4m-pmw8-v6w9",
  "euvd_id": "EUVD-2026-125039",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Memory exhaustion in ExcelJS worksheet parsing",
  "summary": "ExcelJS through 4.4.0 is affected by memory exhaustion when parsing workbooks with an unbounded worksheet column maximum. An attacker who can provide a workbook for processing can cause xlsx.load() to exhaust heap memory and terminate the application.",
  "mitigation": "Upgrade exceljs-hardened to 5.1.0 or later.",
  "vendor": "exceljs",
  "product": "exceljs",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 5.0.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "5.1.0"
      ],
      "package_name": "exceljs-hardened",
      "purl": "pkg:npm/exceljs-hardened"
    }
  ],
  "cwes": [
    770
  ],
  "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",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 16.359571633333335,
  "t0_at": "2026-11-13T09:33:37.051000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-16T16:01:10+00:00",
      "days": -27.730868645833333,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:33:37.051000+00:00",
      "url": "https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-w57r-3mm6-w6g7"
    },
    "trigger_signal": {
      "at": "2026-11-13T09:33:37.051000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:33:37.051000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-128338"
    }
  }
}