CVE-2026-40863
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.
How to fix
- phpoffice phpspreadsheet1.30.4, 2.1.16, 2.4.5, 3.10.5, 5.7.0 or later
- phpoffice/phpspreadsheet5.7.0, 3.10.5, 2.4.5, 2.1.16, 1.30.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phpoffice phpspreadsheet | v < 1.30.4, 2.0.0 ≤ v < 2.1.16, 2.2.0 ≤ v < 2.4.5, 3.3.0 ≤ v < 3.10.5, 4.0.0 ≤ v < 5.7.0 | 1.30.4, 2.1.16, 2.4.5, 3.10.5, 5.7.0 |
| phpoffice/phpspreadsheetPackagist | 4.0.0 ≤ v < 5.7.0, 3.3.0 ≤ v < 3.10.5, 2.2.0 ≤ v < 2.4.5, 2.0.0 ≤ v < 2.1.16, v < 1.30.6 | 5.7.0, 3.10.5, 2.4.5, 2.1.16, 1.30.6 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.