PhpSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59932
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-28 19:17:39 UTC
Updated2026-07-28 19:17:39 UTC
DescriptionPhpSpreadsheet 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PHPOffice PhpSpreadsheet affected >= 4.0.0, < 5.8.1 Not specified
CNA PHPOffice PhpSpreadsheet affected >= 3.3.0, < 3.10.7 Not specified
CNA PHPOffice PhpSpreadsheet affected >= 2.2.0, < 2.4.7 Not specified
CNA PHPOffice PhpSpreadsheet affected >= 2.0.0, < 2.1.18 Not specified
CNA PHPOffice PhpSpreadsheet affected < 1.30.6 Not specified

References

ReferenceSourceLinkTags
github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.18 [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/commit/85f2556b0bf5269061bf45932ecda... [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.6 [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.8.1 [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.7 [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.7 [email protected] github.com
github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2mrg-gjxq-2gvr [email protected] github.com
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