CVE-2026-44020— Docling: Unsafe XML Entity Expansion in USPTO Patent Backend
Possible ATT&CK Techniques 3AI
T1105 · Ingress Tool Transfer T1498 · Network Denial of Service T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 |
|---|
AI-Generated POCPremium
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
- CVE-2026-47214
Docling: Unsafe URI and Path Handling in HTML Backend - CVE-2026-44018
Docling: Unsafe Archive Extraction and XML Parsing in METS-G - CVE-2026-44017
Docling: Unsafe Zip Extraction in EasyOCR Model Download - CVE-2026-44022
Docling: Potential Path Traversal via LaTeX \includegraphics - CVE-2026-44016
Docling: Unsafe Playwright-based HTML Rendering
Same vendor: docling-project
- CVE-2026-44023
Docling Core has unsafe remote filename resolution - CVE-2026-44019
Docling Core has insufficient validation of image reference - CVE-2026-47214
Docling: Unsafe URI and Path Handling in HTML Backend - CVE-2026-44018
Docling: Unsafe Archive Extraction and XML Parsing in METS-G - CVE-2026-44017
Docling: Unsafe Zip Extraction in EasyOCR Model Download
Same weakness: CWE-776
- CVE-2026-73569
fast-xml-parser: Repeated DOCTYPE declarations reset entity - CVE-2026-3415
XML External Entity (XXE) Injection via Schema Validation in - CVE-2026-14865
XXE Denial of Service via RadLayoutBuilder Client State in T - CVE-2026-14979
IBM Engineering Lifecycle Management - Jazz Foundation is vu - CVE-2026-45304
Symfony: YAML Parser Exponential Memory Allocation via Recur
V. Comments for CVE-2026-44020
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