CVE-2026-40902
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.
Affected products
2<= 1.30.3+ 1 more
- (no CPE)range: <= 1.30.3
- cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*range: <1.30.4
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6mnvdExploitMitigationVendor Advisory
- github.com/advisories/GHSA-7c6m-4442-2x6mghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40902ghsa
News mentions
0No linked articles in our index yet.