{"id":"CVE-2026-108358","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-108358","generatedAt":"2026-10-27T23:59:07.331Z","title":"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.","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.","published":"2026-10-22T18:17:27.000Z","lastModified":"2026-10-23T22:16:53.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.8,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-611","CWE-776"],"affected":[],"epss":{"score":0.00483,"percentile":0.41325,"date":"2026-10-26","history":[{"date":"2026-10-23","score":0.00385,"percentile":0.31421}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T18:17:27.000Z","detail":{"score":"8.8","severity":"HIGH","publishedAt":"2026-10-22T18:17:26.553Z"},"summary":"New CVE, high severity (CVSS 8.8)."}],"references":[{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0","source":"security-advisories@github.com"},{"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-108358","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}