Improper Handling of Highly Compressed Data (Data Amplification) Affecting phpoffice/phpspreadsheet package, versions <1.30.6>=2.0.0, <2.1.18>=2.2.0, <2.4.7>=3.3.0, <3.10.7>=4.0.0, <5.8.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-PHPOFFICEPHPSPREADSHEET-18307194
- published25 Jul 2026
- disclosed23 Jul 2026
- creditUnknown
Introduced: 23 Jul 2026
CVE-2026-59932 (opens in a new tab)How to fix?
Upgrade phpoffice/phpspreadsheet to version 1.30.6, 2.1.18, 2.4.7, 3.10.7, 5.8.1 or higher.
Overview
phpoffice/phpspreadsheet is a Spreadsheet engine that Read, Create and Write Spreadsheet documents in PHP .
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) through the gzfileGetContents process. An attacker can exhaust system memory and cause a crash by uploading a specially crafted, highly compressed .gnumeric file that decompresses to a size exceeding the available memory limit.