{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.3.0"
                  },
                  {
                    "fixed": "3.10.8"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "fixed": "5.10.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "89f455c133e1a7e2d4abfadc43ce29eb7450d781"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "980b5c294493856f1a25754f1e8a1d2185b93738"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "3.10.8",
                "range": [
                  {
                    "fixed": "fee9c1ca8d9f1f676f007ac1ab134ce43624bd52"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "5.10.0",
                "range": [
                  {
                    "fixed": "eb18727acf6b1f4cc67145a52ab04f9fd4c28d53"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "87ddd21eb0b6b7ad20a11d314348ef307475f547"
            },
            {
              "fixed": "fee9c1ca8d9f1f676f007ac1ab134ce43624bd52"
            },
            {
              "introduced": "2d4b9f3582102aafb6b1378fff8a20eeeacfb31c"
            },
            {
              "fixed": "eb18727acf6b1f4cc67145a52ab04f9fd4c28d53"
            },
            {
              "fixed": "89f455c133e1a7e2d4abfadc43ce29eb7450d781"
            },
            {
              "fixed": "980b5c294493856f1a25754f1e8a1d2185b93738"
            }
          ],
          "repo": "https://github.com/phpoffice/phpspreadsheet",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rxj4-h86g-25gc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-611",
      "CWE-776"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108357.json"
  },
  "details": "PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. From 3.3.0 until 3.10.8 and 5.10.0, Reader\\Xml passes stored SpreadsheetML XML through XmlScanner::scan in Xml::canRead and Xml::trySimpleXMLLoadStringPrivate, while Xml::unentity decodes numeric entities only after each DOCTYPE pattern check. A double-encoded less-than character is reduced by the first callback to another encoded character and by the second callback to a literal less-than sign, so SimpleXML receives an unchecked DOCTYPE and entity declaration. Processing attacker-controlled SpreadsheetML XML can cause entity-expansion denial of service and can permit local file access or SSRF on PHP before 8.0 or when LIBXML_NOENT is enabled. This issue is fixed in versions 3.10.8 and 5.10.0.",
  "id": "CVE-2026-108357",
  "modified": "2026-10-23T02:30:33.429455391Z",
  "published": "2026-10-22T17:38:16.098Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108357.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781"
    },
    {
      "type": "FIX",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-108357"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service"
}