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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-59932

PhpSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustion

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

PHPOffice PhpSpreadsheet

  • >= 4.0.0, < 5.8.1affected
  • >= 3.3.0, < 3.10.7affected
  • >= 2.2.0, < 2.4.7affected
  • >= 2.0.0, < 2.1.18affected
  • < 1.30.6affected

References