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.
References
| Link | Resource |
|---|---|
| https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6m | Exploit Mitigation Vendor Advisory |
| https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6m | Exploit Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
14 May 2026, 14:50
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6m - Exploit, Mitigation, Vendor Advisory | |
| First Time |
Phpoffice phpspreadsheet
Phpoffice |
|
| CPE | cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:* |
13 May 2026, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7c6m-4442-2x6m - |
12 May 2026, 22:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-12 22:16
Updated : 2026-05-14 14:50
NVD link : CVE-2026-40902
Mitre link : CVE-2026-40902
CVE.ORG link : CVE-2026-40902
JSON object : View
Products Affected
phpoffice
- phpspreadsheet
CWE
CWE-770
Allocation of Resources Without Limits or Throttling