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 XLSX reader's ColumnAndRowAttributes::readRowAttributes() method reads row numbers from XML attributes without validating them against the spreadsheet maximum row limit (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a minimal XLSX file (~1.6KB) containing a <row r="999999999"/> element that inflates cachedHighestRow to 999,999,999, causing any subsequent row iteration to attempt ~1 billion loop cycles and exhaust CPU resources. This vulnerability is fixed in 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- PHPOffice / PhpSpreadsheet< 1.30.4 – < 1.30.4
- PHPOffice / PhpSpreadsheet>= 2.0.0, < 2.1.16 – >= 2.0.0, < 2.1.16
- PHPOffice / PhpSpreadsheet>= 2.2.0, < 2.4.5 – >= 2.2.0, < 2.4.5
- PHPOffice / PhpSpreadsheet>= 3.3.0, < 3.10.5 – >= 3.3.0, < 3.10.5
- PHPOffice / PhpSpreadsheet>= 4.0.0, < 5.7.0 – >= 4.0.0, < 5.7.0