CVE-2026-15803: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-jwq9-92hc-xq2j
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CWE-611
Published
Advisory Summary

CVE-2026-15803 is a HIGH security vulnerability vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product processes an xml document that can contain xml entities with uris that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-15803 at a Glance

CVE Identifier CVE-2026-15803
GHSA Identifier GHSA-jwq9-92hc-xq2j
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-611: Improper Restriction of XML External Entity Reference
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-15803

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-15803, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-611: Improper Restriction of XML External Entity Reference, where the product processes an xml document that can contain xml entities with uris that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-15803 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15803
Software Security Information SECURITY
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/175
rdf4j.org/release-notes/5.3.2 WEB
https://rdf4j.org/release-notes/5.3.2

Frequently Asked Questions

What is CVE-2026-15803?
CVE-2026-15803 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-611: Improper Restriction of XML External Entity Reference.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-15803?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-15803?
CVE-2026-15803 is classified under CWE-611: Improper Restriction of XML External Entity Reference (The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.).
How can I check Maven dependencies for CVE-2026-15803?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jwq9-92hc-xq2j",
  "modified" : "2026-08-12T18:31:17Z",
  "published" : "2026-08-12T18:31:17Z",
  "aliases" : [ "CVE-2026-15803" ],
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15803"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/175"
  }, {
    "type" : "WEB",
    "url" : "https://rdf4j.org/release-notes/5.3.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-611" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-12T16:16:54Z"
  }
}