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CVE-2026-44020— Docling: Unsafe XML Entity Expansion in USPTO Patent Backend

Quick assessment

Affected
docling-project docling
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.

Docling Project Docling是瑞士Docling Project公司的一款文档解析与转换工具。 Docling Project Docling 2.13.0版本至2.74.0之前版本存在资源管理错误漏洞，该漏洞源于USPTO专利XML解析器使用标准xml.sax.parseString()时未对XML外部实体攻击进行保护，可能导致攻击者读取服务器文件系统上的任意文件、执行服务端请求伪造攻击或通过实体扩展导致拒绝服务。

CVSS 7.5 · High EPSS 0.60% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
docling-project docling >= 2.13.0, < 2.74.0 affected
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I. Basic Information for CVE-2026-44020

Vulnerability Information
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Vulnerability Title
Docling: Unsafe XML Entity Expansion in USPTO Patent Backend
Source: CVE Program / CVE List V5
Vulnerability Description
Docling simplifies document processing by parsing diverse formats and providing integrations with the generative AI ecosystem. From 2.13.0 until 2.74.0, the USPTO patent XML parser used the standard xml.sax.parseString() without protection against XML External Entity (XXE) attacks. An attacker could craft malicious USPTO patent XML files with external entity references that could read arbitrary files from the server filesystem, perform Server-Side Request Forgery (SSRF) attacks, or cause denial of service through entity expansion (Billion Laughs attack). The vulnerability affects three USPTO patent format parsers: ICE (v4.x), Grant v2.5, and Application v1.x. This vulnerability is fixed in 2.74.0.
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
DTD中递归实体索引的不恰当限制(XML实体扩展)
Source: CVE Program / CVE List V5
Vulnerability Title
Docling Project Docling 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docling Project Docling是瑞士Docling Project公司的一款文档解析与转换工具。 Docling Project Docling 2.13.0版本至2.74.0之前版本存在资源管理错误漏洞，该漏洞源于USPTO专利XML解析器使用标准xml.sax.parseString()时未对XML外部实体攻击进行保护，可能导致攻击者读取服务器文件系统上的任意文件、执行服务端请求伪造攻击或通过实体扩展导致拒绝服务。
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
docling-project docling >= 2.13.0, < 2.74.0 -

II. Public POCs for CVE-2026-44020

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8015 chars
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III. Intelligence Information for CVE-2026-44020

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Vendor Advisories for CVE-2026-44020 (1)

Same Patch Batch · docling-project · 2026-06-24 · 4 CVEs total

CVE-2026-44016 8.2 HIGH Docling: Unsafe Playwright-based HTML Rendering
CVE-2026-44017 7.5 HIGH Docling: Unsafe Zip Extraction in EasyOCR Model Download
CVE-2026-44022 5.5 MEDIUM Docling: Potential Path Traversal via LaTeX \includegraphics and \input Commands

IV. Related Vulnerabilities

Same product: docling
Same vendor: docling-project
Same weakness: CWE-776

V. Comments for CVE-2026-44020

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