docling-project docling-graph up to 1.5.0 handlers.py requests.head redirect

Summaryinfo

A vulnerability was found in docling-project docling-graph up to 1.5.0. It has been declared as problematic. This issue affects the function requests.head of the file docling_graph/core/input/handlers.py. Such manipulation leads to redirect. This vulnerability is referenced as CVE-2026-44520. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in docling-project docling-graph up to 1.5.0. It has been rated as problematic. Affected by this issue is the function requests.head of the file docling_graph/core/input/handlers.py. The manipulation with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-44520 since 05/06/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 1.5.1 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• docling-project

Name

• docling-graph

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5.0

Website

• Product: https://github.com/docling-project/docling-graph/

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