{"id":"CVE-2026-108358","revision":"9b2322f5df844bf6a3def52c3a406b44","records":[{"revision":"9b2322f5df844bf6a3def52c3a406b44","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108358","aliases":[],"title":"PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service","description":"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.","state":0,"publishedAt":"2026-10-22T17:29:56.449+00:00","modifiedAt":"2026-10-22T17:29:56.449+00:00","affected":[{"ecosystem":"Vendor product","name":"PhpSpreadsheet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"PHPOffice\",\n                    \"product\": \"PhpSpreadsheet\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.30.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.0.0, < 2.1.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.2.0, < 2.4.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 3.3.0, < 3.10.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 4.0.0, < 5.10.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.8,"severity":"HIGH"}],"references":["https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c","https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66","https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781","https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738","https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9","https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108358","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108358","identifiers":["CVE-2026-108358"]},"retained":false,"historicalAffected":[]}],"coverage":[]}