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CVE-2026-59932— PhpSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustion

Quick assessment

Affected
PHPOffice PhpSpreadsheet
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHPOffice PhpSpreadsheet是PHPOffice组织开源的一款用于读取和写入电子表格文件的PHP库。 PHPOffice PhpSpreadsheet 4.0.0至5.8.0版本、3.3.0至3.10.6版本、2.2.0至2.4.6版本、2.0.0至2.1.17版本和1.30.5及之前版本存在资源管理错误漏洞，该漏洞源于Gnumeric reader读取攻击者提供的.gnumeric文件时，未对解压缩大小进行限制，可能导致小压缩文件扩展成大于PHP内存限制的数据，造成进程崩溃，从而引起

CVSS 7.5 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
PHPOffice PhpSpreadsheet >= 4.0.0, < 5.8.1 affected
>= 3.3.0, < 3.10.7 affected
>= 2.2.0, < 2.4.7 affected
>= 2.0.0, < 2.1.18 affected
< 1.30.6 affected
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I. Basic Information for CVE-2026-59932

Vulnerability Information
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Vulnerability Title
PhpSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
PHPOffice PhpSpreadsheet 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHPOffice PhpSpreadsheet是PHPOffice组织开源的一款用于读取和写入电子表格文件的PHP库。 PHPOffice PhpSpreadsheet 4.0.0至5.8.0版本、3.3.0至3.10.6版本、2.2.0至2.4.6版本、2.0.0至2.1.17版本和1.30.5及之前版本存在资源管理错误漏洞，该漏洞源于Gnumeric reader读取攻击者提供的.gnumeric文件时，未对解压缩大小进行限制，可能导致小压缩文件扩展成大于PHP内存限制的数据，造成进程崩溃，从而引起
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHPOffice PhpSpreadsheet >= 4.0.0, < 5.8.1 -

II. Public POCs for CVE-2026-59932

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9754 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-59932

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Patches & Fixes for CVE-2026-59932 (1)

Vendor Advisories for CVE-2026-59932 (1)

Vendor Pages for CVE-2026-59932 (5)

Same Patch Batch · PHPOffice · 2026-07-28 · 3 CVEs total

CVE-2026-59931 7.7 HIGH PhpSpreadsheet: SSRF bypass via HTTP redirect in WEBSERVICE() domain whitelist
CVE-2026-59933 7.5 HIGH PhpSpreadsheet: XLS/OLE sector-chain self-loop causes memory exhaustion

IV. Related Vulnerabilities

Same product: PhpSpreadsheet
Same vendor: PHPOffice
Same weakness: CWE-400

V. Comments for CVE-2026-59932

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