CVE-2026-40902

{
  "id": "CVE-2026-40902",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-12T22:16:33.923",
  "lastModified": "2026-10-26T14:10:00.130",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the XLSX reader's ColumnAndRowAttributes::readRowAttributes() method reads row numbers from XML attributes without validating them against the spreadsheet maximum row limit (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a minimal XLSX file (~1.6KB) containing a <row r=\"999999999\"/> element that inflates cachedHighestRow to 999,999,999, causing any subsequent row iteration to attempt ~1 billion loop cycles and exhaust CPU resources. This vulnerability is fixed in 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0."
    },
    {
      "lang": "es",
      "value": "PhpSpreadsheet es una biblioteca PHP pura para leer y escribir archivos de hoja de cálculo. Antes de 1.30.4, 2.1.16, 2.4.5, 3.10.5 y 5.7.0, el método ColumnAndRowAttributes::readRowAttributes() del lector XLSX lee números de fila de atributos XML sin validarlos contra el límite máximo de filas de la hoja de cálculo (AddressRange::MAX_ROW = 1.048.576). Un atacante puede crear un archivo XLSX mínimo (~1,6KB) que contenga un elemento <row r=’999999999’/> que infla cachedHighestRow a 999.999.999, lo que hace que cualquier iteración de fila posterior intente ~1.000 millones de ciclos de bucle y agote los recursos de la CPU. Esta vulnerabilidad está corregida en 1.30.4, 2.1.16, 2.4.5, 3.10.5 y 5.7.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "PHPOffice",
          "product": "PhpSpreadsheet",
          "versions": [
            {
              "version": "< 1.30.4",
              "status": "affected"
            },
            {
              "version": ">= 2.0.0, < 2.1.16",
              "status": "affected"
            },
            {
              "version": ">= 2.2.0, < 2.4.5",
              "status": "affected"
            },
            {
              "version": ">= 3.3.0, < 3.10.5",
              "status": "affected"
            },
            {
              "version": ">= 4.0.0, < 5.7.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
          "timestamp": "2026-05-13T12:11:26.338564Z",
          "id": "CVE-2026-40902",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
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              "technicalImpact": "partial"
            }
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          "role": "CISA Coordinator",
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
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  "references": [
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6m",
      "source": "[email protected]",
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