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CVE-2026-15803

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-10-23
• Weakness: CWE-611

Description

In Eclipse RDF4J, several XML parser entry points do not fully restrict XML External Entity (XXE) processing when parsing untrusted XML-based RDF data or query results, permitting DOCTYPE declarations, external entity references, and external DTD loading. This is due to an incomplete fix for CVE-2018-1000644: the earlier fix did not cover all parser entry points. The issue is resolved in RDF4J 5.3.2, which rejects or disables DOCTYPE declarations, external entities, and external DTD loading by default.

Affected products

• Eclipse Foundation Eclipse RDF4J: before 5.3.2 — fixed in 5.3.2

How to fix

Upgrade to a fixed version: Eclipse Foundation Eclipse RDF4J 5.3.2. Check the vendor advisory for mitigations.

References

• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/175
• https://rdf4j.org/release-notes/5.3.2/

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