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bdu:2023-05939

2026-10-14T17:21:14.847647+00:00

bdu:2023-05939

EUVD-2026-189467

2026-10-14T17:21:14.847676+00:00

EUVD-2026-189467

fkie_cve-2023-41034

2026-10-14T17:21:14.847690+00:00

Eclipse Leshan is a device management server and client Java implementation. In affected versions DDFFileParser` and `DefaultDDFFileValidator` (and so `ObjectLoader`) are vulnerable to `XXE Attacks`. A DDF file is a LWM2M format used to store LWM2M object description. Leshan users are impacted only if they parse untrusted DDF files (e.g. if they let external users provide their own model), in that case they MUST upgrade to fixed version. If you parse only trusted DDF file and validate only with trusted xml schema, upgrading is not mandatory. This issue has been fixed in versions 1.5.0 and 2.0.0-M13. Users are advised to upgrade. There are no known workarounds for this vulnerability.

GHSA-wc9j-gc65-3cm7 — DDFFileParser is vulnerable to XXE Attacks

2026-10-14T17:21:14.847735+00:00

Affected: Maven: org.eclipse.leshan:leshan-core

### Impact `DDFFileParser` and `DefaultDDFFileValidator` (and so `ObjectLoader`) are vulnerable to [XXE Attacks](https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing).

[DDF file](https://github.com/eclipse-leshan/leshan/wiki/Adding-new-objects#the-lwm2m-model) is a LWM2M format used to store LWM2M object description. Leshan users are impacted only if they parse untrusted DDF files (e.g. if they let external users provide their own model), in that case they MUST upgrade to fixed version. If you parse only trusted DDF file and validate only with trusted xml schema, upgrading is not mandatory.

### Patches This is fixed in **v1.5.0** and **2.0.0-M13**.

### Workarounds No easy way. Eventually writing your own `DDFFileParser`/`DefaultDDFFileValidator` (and so `ObjectLoader`) creating a `DocumentBuilderFactory` with : ```java // For DDFFileParser DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); // Disable DTDs factory.setXIncludeAware(false); // Disable XML Inclusions factory.setExpandEntityReferences(false); // disable expand entity reference nodes

// For DefaultDDFFileValidator SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); factory.setProperty(XMLConstants.ACCESS_EXTER…

gsd-2023-41034

2026-10-14T17:21:14.847818+00:00

gsd-2023-41034