CVE-2026-108358 (GCVE-0-2026-108358)

Vulnerability from cvelistv5 – Published: 2026-10-22 17:29 – Updated: 2026-10-23 21:08
VLAI
Title
PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service
Summary
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection pattern that accounts for NUL-byte interleaving but not ISO-2022 escape sequences in XLSX XML parts. The escape sequences prevent the scanner from matching the declaration, and XML charset normalization then removes the escape bytes before parsing, exposing a valid DOCTYPE and entity definitions. Processing an attacker-controlled XLSX can therefore cause entity-expansion denial of service on supported PHP versions 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 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 17:32 UTC
CWE
  • CWE-611 - Improper Restriction of XML External Entity Reference
  • CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7761 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
PHPOffice PhpSpreadsheet Affected: < 1.30.7
Affected: >= 2.0.0, < 2.1.19
Affected: >= 2.2.0, < 2.4.8
Affected: >= 3.3.0, < 3.10.8
Affected: >= 4.0.0, < 5.10.0
guessed Create a notification for this product.
Show details on NVD website

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            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c"
            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7"
            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19"
            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8"
            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8"
            },
            {
              "name": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0"
            }
          ],
          "source": {
            "advisory": "GHSA-3x94-m842-937c",
            "discovery": "UNKNOWN"
          },
          "title": "PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-108358",
        "datePublished": "2026-10-22T17:29:56.449Z",
        "dateReserved": "2026-10-09T20:32:44.301Z",
        "dateUpdated": "2026-10-23T21:08:28.517Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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