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CVE-2026-59932

Estado: AplazadaAlta (7.5)—

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the Gnumeric reader reads attacker-supplied .gnumeric files into memory and, when the file starts with gzip magic bytes, calls gzdecode() on the full compressed contents without enforcing a decompressed-size limit.

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A very small compressed .gnumeric file can expand to data larger than the PHP memory limit and crash the process during Gnumeric::canRead() before the file is rejected or fully parsed. This is reachable through normal file-type detection and Gnumeric loading paths, so applications that accept attacker-controlled spreadsheet uploads can suffer denial of service. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Aplicación expuesta (PhpSpreadsheet en servidor) que procesa archivos Gnumeric maliciosos sin límite de descompresión, causando DoS por agotamiento de memoria.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Phpoffice — PhpspreadsheetAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-59932",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59932",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-29T13:56:10.618961Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "PHPOffice",
          "product": "PhpSpreadsheet",
          "versions": [
            {
              "status": "affected",
              "version": ">= 4.0.0, < 5.8.1"
            },
            {
              "status": "affected",
              "version": ">= 3.3.0, < 3.10.7"
            },
            {
              "status": "affected",
              "version": ">= 2.2.0, < 2.4.7"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0, < 2.1.18"
            },
            {
              "status": "affected",
              "version": "< 1.30.6"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-28T19:17:39.590",
  "references": [
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/85f2556b0bf5269061bf45932ecda8a128d81750",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.6",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.18",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.7",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.7",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.8.1",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2mrg-gjxq-2gvr",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2mrg-gjxq-2gvr",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-409"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the Gnumeric reader reads attacker-supplied .gnumeric files into memory and, when the file starts with gzip magic bytes, calls gzdecode() on the full compressed contents without enforcing a decompressed-size limit. A very small compressed .gnumeric file can expand to data larger than the PHP memory limit and crash the process during Gnumeric::canRead() before the file is rejected or fully parsed. This is reachable through normal file-type detection and Gnumeric loading paths, so applications that accept attacker-controlled spreadsheet uploads can suffer denial of service. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6."
    }
  ],
  "lastModified": "2026-07-30T19:33:00.343",
  "sourceIdentifier": "security-advisories@github.com"
}