CVE-2026-40902— PhpSpreadsheet: CPU Denial of Service via Unbounded Row Number in XLSX Row Dimensions
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| PHPOffice | PhpSpreadsheet | < 1.30.4 | affected |
>= 2.0.0, < 2.1.16 | affected | ||
>= 2.2.0, < 2.4.5 | affected | ||
>= 3.3.0, < 3.10.5 | affected | ||
>= 4.0.0, < 5.7.0 | affected |
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-40902
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View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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: CPU Denial of Service via Unbounded Row Number in XLSX Row Dimensions
Source: NVD (National Vulnerability Database)
Vulnerability Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the XLSX reader's ColumnAndRowAttributes::readRowAttributes() method reads row numbers from XML attributes without validating them against the spreadsheet maximum row limit (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a minimal XLSX file (~1.6KB) containing a <row r="999999999"/> element that inflates cachedHighestRow to 999,999,999, causing any subsequent row iteration to attempt ~1 billion loop cycles and exhaust CPU resources. This vulnerability is fixed in 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
PhpSpreadsheet 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PhpSpreadsheet是PHPOffice开源的一款用于读取和写入电子表格文件的PHP库。 PhpSpreadsheet 1.30.4之前版本、2.1.16之前版本、2.4.5之前版本、3.10.5之前版本和5.7.0之前版本存在安全漏洞，该漏洞源于XLSX读取器的ColumnAndRowAttributes::readRowAttributes方法未验证行号是否超过最大行限制，可能导致攻击者制作恶意文件导致CPU资源耗尽。
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 | < 1.30.4 | - |
II. Public POCs for CVE-2026-40902
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-40902
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same product: PhpSpreadsheet
- CVE-2026-40863
PhpSpreadsheet: CPU Denial of Service via Unbounded Row Inde - CVE-2026-40296
PhpSpreadsheet vulnerable to XSS in HTML writer via custom n - CVE-2026-35453
PhpSpreadsheet XSS via number format text substitution in HT - CVE-2026-34084
PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFac - CVE-2025-54370
PhpSpreadsheet vulnerable to SSRF when reading and displayin
Same vendor: PHPOffice
- CVE-2026-40863
PhpSpreadsheet: CPU Denial of Service via Unbounded Row Inde - CVE-2026-40296
PhpSpreadsheet vulnerable to XSS in HTML writer via custom n - CVE-2026-35453
PhpSpreadsheet XSS via number format text substitution in HT - CVE-2026-34084
PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFac - CVE-2025-54370
PhpSpreadsheet vulnerable to SSRF when reading and displayin
Same weakness: CWE-770
- CVE-2026-2325
Improper Input Validation in MS Teams Meetings API Handler - CVE-2021-47959
WordPress Plugin WPGraphQL 1.3.5 Denial of Service - CVE-2026-44679
Tuist: Forgot password flow lacks throttling for reset email - CVE-2026-44216
Wasmtime: Panic when allocating a table exceeding the size o - CVE-2026-8468
Unbounded buffer accumulation in multipart header parsing ca
V. Comments for CVE-2026-40902
No comments yet