CVE-2026-40863

{
  "id": "CVE-2026-40863",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-12T22:16:33.783",
  "lastModified": "2026-10-26T18:10:00.173",
  "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 SpreadsheetML XML reader (Reader\\Xml) does not validate the ss:Index row attribute against the maximum allowed row count (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a SpreadsheetML XML file with ss:Index=\"999999999\" on a <Row> element, which inflates the internal cachedHighestRow to ~1 billion. Any subsequent call to getRowIterator() without an explicit end row will attempt to iterate ~1 billion rows, causing CPU exhaustion and denial of service. 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 lector XML de SpreadsheetML (Reader\\Xml) no valida el atributo de fila ss:Index contra el recuento máximo de filas permitido (AddressRange::MAX_ROW = 1,048,576). Un atacante puede crear un archivo XML de SpreadsheetML con ss:Index=’999999999’ en un elemento [Row], lo que infla el cachedHighestRow interno a ~mil millones. Cualquier llamada subsiguiente a getRowIterator() sin una fila final explícita intentará iterar ~mil millones de filas, causando agotamiento de CPU y denegación de servicio. 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": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-13T15:01:42.488212Z",
          "id": "CVE-2026-40863",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
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          "operator": "OR",
          "negate": false,
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  "references": [
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6",
      "source": "[email protected]",
      "tags": [
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}