CVE-2026-108359: CWE-400: Uncontrolled Resource Consumption in PHPOffice PhpSpreadsheet
Description
PhpSpreadsheet versions prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0 contain a vulnerability in the Ods::processTableRow function. This vulnerability allows an attacker to specify an unbounded number of repeated rows in an ODS spreadsheet file, causing uncontrolled resource consumption. The issue can lead to substantial CPU and memory usage, potentially terminating the PHP worker process. This vulnerability has been fixed in the stated versions.
CVSS v4.0
Score 8.7high
Affected software
PHPOffice
PhpSpreadsheet
pkg:composer/phpoffice/phpspreadsheetRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-108359 affects the PHPOffice PhpSpreadsheet library in the Ods::processTableRow function. The function accepts the table:number-rows-repeated attribute from an ODS table row without bounding it against the spreadsheet row limit. This allows an attacker to craft a malicious ODS file with a large repetition count, causing the reader to materialize excessive cells and consume excessive CPU and memory resources. Column repetition is not affected by this issue. The vulnerability is addressed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.
Potential Impact
Exploitation of this vulnerability can cause denial of service by exhausting CPU and memory resources of the PHP worker processing the spreadsheet file. This can lead to termination of the PHP process and disruption of services relying on PhpSpreadsheet for ODS file processing.
Mitigation Recommendations
Upgrade PhpSpreadsheet to version 1.30.7, 2.1.19, 2.4.8, 3.10.8, or 5.10.0 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-09T20:32:44.301Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada4bef4d27ba8daa6ca6f8
Added to database: 10/22/2026, 17:46:23 UTC
Last enriched: 10/22/2026, 18:00:35 UTC
Last updated: 10/22/2026, 18:01:31 UTC
Views: 8
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