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Vulnerability record · CVE-2026-59932 · published 28 July 2026

CVE-2026-59932: Uncontrolled resource consumption vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.70% · top 48.8% CWE-400 · Uncontrolled resource consumptionCWE-409 · CWE-409 Deferred
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://github.com/PHPOffice/PhpSpreadsheet/commit/85f2556b0bf5269061bf45932ecda8a128d81750
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.6
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.18
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.7
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.7
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.8.1
https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2mrg-gjxq-2gvr
https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2mrg-gjxq-2gvr

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Source: NIST National Vulnerability Database (record CVE-2026-59932), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.