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CVE-2026-44520— Docling-Graph: SSRF via Missing Internal IP Validation in URLInputHandler

Quick assessment

Affected
docling-project docling-graph
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.

Docling Graph是Docling Project开源的一个将文档内容转换为知识图谱的结构化数据处理工具。 Docling Graph 1.5.1之前版本存在输入验证错误漏洞，该漏洞源于URLInputHandler未验证目标IP地址，可能导致服务器端请求伪造攻击。

CVSS 5.7 · Medium EPSS 0.31% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
docling-project docling-graph < 1.5.1 affected
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I. Basic Information for CVE-2026-44520

Vulnerability Information
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Vulnerability Title
Docling-Graph: SSRF via Missing Internal IP Validation in URLInputHandler
Source: CVE Program / CVE List V5
Vulnerability Description
Docling-Graph turns documents into validated Pydantic objects, then builds a directed knowledge graph with explicit semantic relationships. Prior to 1.5.1, the URLInputHandler class in docling_graph/core/input/handlers.py makes HTTP requests to user-supplied URLs without validating whether the target resolves to a private, loopback, or link-local IP address. The URLValidator only checks for a valid scheme and non-empty netloc, performing no IP-level validation. Additionally, requests.head() was called with allow_redirects=True, allowing an attacker to redirect requests to internal endpoints via an intermediary URL. An attacker who can control the --source CLI argument or PipelineConfig.source API parameter can trigger Server-Side Request Forgery (SSRF). This vulnerability is fixed in 1.5.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Docling Graph 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docling Graph是Docling Project开源的一个将文档内容转换为知识图谱的结构化数据处理工具。 Docling Graph 1.5.1之前版本存在输入验证错误漏洞，该漏洞源于URLInputHandler未验证目标IP地址，可能导致服务器端请求伪造攻击。
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-graph < 1.5.1 -

II. Public POCs for CVE-2026-44520

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III. Intelligence Information for CVE-2026-44520

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Vendor Advisories for CVE-2026-44520 (1)

IV. Related Vulnerabilities

Same vendor: docling-project
Same weakness: CWE-601

V. Comments for CVE-2026-44520

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