CVE-2026-59932

Summary

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the Gnumeric reader reads attacker-supplied .gnumeric files into memory and, when the file starts with gzip magic bytes, calls gzdecode() on the full compressed contents without enforcing a decompressed-size limit. A very small compressed .gnumeric file can expand to data larger than the PHP memory limit and crash the process during Gnumeric::canRead() before the file is rejected or fully parsed. This is reachable through normal file-type detection and Gnumeric loading paths, so applications that accept attacker-controlled spreadsheet uploads can suffer denial of service. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.

Affected Software

VendorProductVersion RangeStatus
PHPOfficePhpSpreadsheet>= 4.0.0, < 5.8.1affected
PHPOfficePhpSpreadsheet>= 3.3.0, < 3.10.7affected
PHPOfficePhpSpreadsheet>= 2.2.0, < 2.4.7affected
PHPOfficePhpSpreadsheet>= 2.0.0, < 2.1.18affected
PHPOfficePhpSpreadsheet< 1.30.6affected

Weaknesses

  • CWE-400: CWE-400: Uncontrolled Resource Consumption
  • CWE-409: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)

References