{"id":"CVE-2026-108358","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 th…","severity":"high","cvss":8.8,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-611","CWE-776"],"vendor":"PHPOffice","product":"PhpSpreadsheet","affected":["PhpSpreadsheet < 1.30.7","PhpSpreadsheet >= 2.0.0, < 2.1.19","PhpSpreadsheet >= 2.2.0, < 2.4.8","PhpSpreadsheet >= 3.3.0, < 3.10.8","PhpSpreadsheet >= 4.0.0, < 5.10.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-23T17:32:56.137020Z"},"published":"2026-10-22","updated":"2026-10-23","sourceUpdated":"2026-10-23T21:08:28.517Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108358","references":[{"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c","label":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66","label":"https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781","label":"https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738","label":"https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9","label":"https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c","label":"https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7","label":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19","label":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8","label":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8","label":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0","label":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0"}],"tags":["cve.org"],"epss":0.00385,"epssPercentile":0.31421,"ingestedAt":"2026-10-22T22:00:50.353Z","slug":"CVE-2026-108358","body":"## Overview\n\nPhpSpreadsheet 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.\n\n## Affected\n\n- `PhpSpreadsheet < 1.30.7`\n- `PhpSpreadsheet >= 2.0.0, < 2.1.19`\n- `PhpSpreadsheet >= 2.2.0, < 2.4.8`\n- `PhpSpreadsheet >= 3.3.0, < 3.10.8`\n- `PhpSpreadsheet >= 4.0.0, < 5.10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}