Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

CVSS 7.5 · High EPSS 0.69% · P49

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProductVersion RangeStatus
PHPOfficePhpSpreadsheet>= 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
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-59932

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Affected Products

VendorProductAffected VersionsCPESubscribe
PHPOfficePhpSpreadsheet >= 4.0.0, < 5.8.1 -

II. Public POCs for CVE-2026-59932

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9754 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-59932

请登录查看更多情报信息。

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-2026-599317.7 HIGHPhpSpreadsheet: SSRF bypass via HTTP redirect in WEBSERVICE() domain whitelist
CVE-2026-599337.5 HIGHPhpSpreadsheet: 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

No comments yet

Leave a comment