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CVE-2026-108358— PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service

Quick assessment

Affected
PHPOffice PhpSpreadsheet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PhpSpreadsheet 是一个用于读写电子表格文件的纯 PHP 库。在版本 1.30.7、2.1.19、2.4.8、3.10.8 和 5.10.0 之前， 中的 方法所使用的 DOCTYPE 检测模式虽然考虑了空字节（NUL-byte）交错的情况，但未能处理 XLSX 文件中 XML 部分存在的 ISO-2022 转义序列。这些转义序列会阻止扫描器匹配到 DOCTYPE 声明；随后，XML 字符集规范化过程会在解析前移除这些转义字节，从而暴露出有效的 DOCTYPE 声明和实体定义。因此，处理由攻击者控制的

CVSS 8.8 · High

Affected Version Matrix 5

VendorProduct Version RangeStatus
PHPOffice PhpSpreadsheet < 1.30.7 affected
>= 2.0.0, < 2.1.19 affected
>= 2.2.0, < 2.4.8 affected
>= 3.3.0, < 3.10.8 affected
>= 4.0.0, < 5.10.0 affected
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I. Basic Information for CVE-2026-108358

Vulnerability Information
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Vulnerability Title
PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection pattern that accounts for NUL-byte interleaving but not ISO-2022 escape sequences in XLSX XML parts. The escape sequences prevent the scanner from matching the declaration, and XML charset normalization then removes the escape bytes before parsing, exposing a valid DOCTYPE and entity definitions. Processing an attacker-controlled XLSX can therefore cause entity-expansion denial of service on supported PHP versions and can permit local file access or SSRF on PHP before 8.0 or when LIBXML_NOENT is enabled. This issue is fixed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHPOffice PhpSpreadsheet < 1.30.7 -

II. Public POCs for CVE-2026-108358

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III. Intelligence Information for CVE-2026-108358

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Other References for CVE-2026-108358 (11)

Same Patch Batch · PHPOffice · 2026-10-22 · 4 CVEs total

CVE-2026-108357 8.8 HIGH PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Deni
CVE-2026-108359 8.7 HIGH PhpSpreadsheet ODS Reader: Unbounded number-rows-repeated → CPU & Memory Exhaustion (DoS)
CVE-2026-108360 6.4 MEDIUM PhpSpreadsheet: SSRF whitelist bypass via unre-validated HTTP redirect in Drawing::setPath

IV. Related Vulnerabilities

Same product: PhpSpreadsheet
Same vendor: PHPOffice
Same weakness: CWE-611

V. Comments for CVE-2026-108358

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