CVE-2026-40863PhpSpreadsheet: CPU Denial of Service via Unbounded Row Index in SpreadsheetML XML Reader
Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the SpreadsheetML XML reader (Reader\Xml) does not validate the ss:Index row attribute against the maximum allowed row count (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a <Row> element, which inflates the internal cachedHighestRow to ~1 billion. Any subsequent call to getRowIterator() without an explicit end row will attempt to iterate ~1 billion rows, causing CPU exhaustion and denial of service. This vulnerability is fixed in 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0.
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| PHPOffice | PhpSpreadsheet | < 1.30.4, >= 2.0.0, < 2.1.16, >= 2.2.0, < 2.4.5, >= 3.3.0, < 3.10.5, >= 4.0.0, < 5.7.0 |
References and patches
- https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6 ExploitMitigationVendor Advisory
CPE matches (NVD) (5)
cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*< 1.30.4cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*≥ 2.0.0 < 2.1.16cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*≥ 2.2.0 < 2.4.5cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*≥ 3.3.0 < 3.10.5cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*≥ 4.0.0 < 5.7.0