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 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
phpoffice/phpspreadsheetPackagist | >= 4.0.0, < 5.7.0 | 5.7.0 |
phpoffice/phpspreadsheetPackagist | >= 3.3.0, < 3.10.5 | 3.10.5 |
phpoffice/phpspreadsheetPackagist | >= 2.2.0, < 2.4.5 | 2.4.5 |
phpoffice/phpspreadsheetPackagist | >= 2.0.0, < 2.1.16 | 2.1.16 |
phpoffice/phpspreadsheetPackagist | < 1.30.4 | 1.30.4 |
Affected products
3<= 1.30.3+ 1 more
- (no CPE)range: <= 1.30.3
- cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*range: <1.30.4
Patches
Vulnerability mechanics
References
3- github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6mnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-7c6m-4442-2x6mghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40902ghsaADVISORY
News mentions
0No linked articles in our index yet.