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 SpreadsheetML XML reader (Reader\Xml) does not validate the ss:Index row attribute against the maximum allowed row count (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a <Row> element, which inflates the internal cachedHighestRow to ~1 billion. Any subsequent call to getRowIterator() without an explicit end row will attempt to iterate ~1 billion rows, causing CPU exhaustion and denial of service. 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-84wq-86v6-x5j6 | Exploit Mitigation Vendor Advisory |
| https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6 | Exploit Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
13 May 2026, 18:01
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6 - Exploit, Mitigation, Vendor Advisory | |
| CPE | cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:* | |
| First Time |
Phpoffice phpspreadsheet
Phpoffice |
13 May 2026, 16:32
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-84wq-86v6-x5j6 - |
12 May 2026, 22:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-12 22:16
Updated : 2026-05-13 18:01
NVD link : CVE-2026-40863
Mitre link : CVE-2026-40863
CVE.ORG link : CVE-2026-40863
JSON object : View
Products Affected
phpoffice
- phpspreadsheet
CWE
CWE-770
Allocation of Resources Without Limits or Throttling