CVE-2026-40902: 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…

PriorityP343high7.5CVSS 3.1

AVNACLPRNUINSUCNINAH

EPSS

0.40%

31.4th percentile

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 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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
phpoffice	phpspreadsheet	< 1.30.4	1.30.4
phpoffice	phpspreadsheet	—	—
phpoffice	phpspreadsheet	—	—
phpoffice	phpspreadsheet	—	—
phpoffice	phpspreadsheet	—	—
phpoffice	phpspreadsheet	>= 0 < 1.30.4	1.30.4
phpoffice	phpspreadsheet	>= 2.0.0 < 2.1.16	2.1.16
phpoffice	phpspreadsheet	>= 2.0.0 < 2.1.16	2.1.16
phpoffice	phpspreadsheet	>= 2.2.0 < 2.4.5	2.4.5
phpoffice	phpspreadsheet	>= 2.2.0 < 2.4.5	2.4.5
phpoffice	phpspreadsheet	>= 3.3.0 < 3.10.5	3.10.5
phpoffice	phpspreadsheet	>= 3.3.0 < 3.10.5	3.10.5
phpoffice	phpspreadsheet	>= 4.0.0 < 5.7.0	5.7.0
phpoffice	phpspreadsheet	>= 4.0.0 < 5.7.0	5.7.0

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