{"api_version":"1","generated_at":"2026-10-23T01:16:46+00:00","cve":"CVE-2026-108358","urls":{"html":"https://cve.report/CVE-2026-108358","api":"https://cve.report/api/cve/CVE-2026-108358.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-108358","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-108358"},"summary":{"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":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-10-22 18:17:26","updated_at":"2026-10-22 18:17:26"},"problem_types":["CWE-611","CWE-776","CWE-611 CWE-611: Improper Restriction of XML External Entity Reference","CWE-776 CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity 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5.10.0","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"PhpSpreadsheet","vendor":"PHPOffice","versions":[{"status":"affected","version":"< 1.30.7"},{"status":"affected","version":">= 2.0.0, < 2.1.19"},{"status":"affected","version":">= 2.2.0, < 2.4.8"},{"status":"affected","version":">= 3.3.0, < 3.10.8"},{"status":"affected","version":">= 4.0.0, < 5.10.0"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV4_0":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-611","description":"CWE-611: Improper Restriction of XML External Entity Reference","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-776","description":"CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity 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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":"2026-10-22T17:29:56.449Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-22 18:17:26","lastModifiedDate":"2026-10-22 18:17:26","problem_types":["CWE-611","CWE-776","CWE-611 CWE-611: Improper Restriction of XML External Entity Reference","CWE-776 CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity 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XmlScanner Bypass via ISO-2022 Escape Sequences ","CVE":"CVE-2026-108358","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"108358","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences "}]}}}