CVE-2026-61586: Copernik xml factory Remote Code Execution Vulnerability
HIGHCVE-2026-61586 is a HIGH remote code execution vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting Copernik xml factory libraries in the Maven ecosystem. The issue involves copernik xml factory (stock jdk provider) has improper restriction of xinclude resource resolution. Remediation is available by upgrading affected packages to version 0.1.2.
CVE-2026-61586 at a Glance
How to Fix CVE-2026-61586
To remediate this vulnerability, upgrade all affected Copernik xml factory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>eu.copernik</groupId>
<artifactId>copernik-xml-factory</artifactId>
<version>0.1.2</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=eu.copernikHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-61586, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=eu.copernikAnalyze the terminal output to locate any version of Copernik xml factory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.2), your application is affected.
Note: The mvn dependency:tree -Dincludes=eu.copernik 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 Copernik xml factory, 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
CVE-2026-61586 Affected Copernik xml factory Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
eu.copernik:copernik-xml-factory
|
Maven |
< 0.1.2
|
0.1.2
|
References
Frequently Asked Questions
What is CVE-2026-61586?
Which Copernik xml factory versions are affected?
What version fixes CVE-2026-61586?
Is copernik-xml-factory affected?
What CWE is associated with CVE-2026-61586?
How can I check Maven dependencies for CVE-2026-61586?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-xm28-xvqc-gxxg",
"modified" : "2026-10-02T18:27:17Z",
"published" : "2026-10-02T18:27:17Z",
"aliases" : [ "CVE-2026-61586" ],
"summary" : "Copernik XML Factory (stock JDK provider) has Improper restriction of XInclude resource resolution",
"details" : "Copernik XML Factory through `0.1.1`, when running on its stock JDK provider, does not block XInclude resource resolution after an application enables XInclude on a factory returned by `XmlFactories.newDocumentBuilderFactory()` or `XmlFactories.newSAXParserFactory()`, or on an `XMLReader` passed through `XmlFactories.harden()`. The library's documented guarantee that XInclude resolution stays disabled therefore does not hold on that provider.\n\nAn application that parses untrusted XML in this configuration can be made to resolve `xi:include` references, allowing an attacker to read local files (information disclosure) or, through `http` hrefs, reach internal network endpoints (SSRF).\n\nAll of the following conditions must hold for an application to be affected:\n- it obtains a factory from `XmlFactories.newDocumentBuilderFactory()` or `XmlFactories.newSAXParserFactory()`, or hardens an externally obtained `XMLReader` with `XmlFactories.harden()`;\n- the stock JDK provider is in effect, that is, Apache Xerces is not on the classpath;\n- XInclude is enabled, by calling `setXIncludeAware(true)` or the equivalent reader feature;\n- it parses XML from an untrusted source.\n\nThe Xerces provider (selected when Xerces is on the classpath) and the Android provider are not affected.\n\nApplications are advised to upgrade to `0.1.2`, which fixes the defect. As a workaround add Apache Xerces (`xercesImpl`) to the classpath so the library selects its unaffected Xerces provider.\n\n### Acknowledgements\n\nThe maintainer thank the following people for finding, reporting, and helping to remediate this issue:\n\n- Finders: Ta Duc Thien and Duc Anh Nguyen (Danzation)\n- Remediation developer: Ta Duc Thien\n- Tooling: Claude Code (Anthropic), Claude Opus 4.8",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "eu.copernik:copernik-xml-factory"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.1.2"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/copernik-eu/copernik-xml-factory/security/advisories/GHSA-xm28-xvqc-gxxg"
}, {
"type" : "WEB",
"url" : "https://github.com/copernik-eu/copernik-xml-factory/commit/2fa042c44931b0a4ddd585d62b97a8a987efd6c6"
}, {
"type" : "WEB",
"url" : "https://github.com/copernik-eu/copernik-xml-factory/commit/e5febc6039ed4b0088245acb80ed7d6d6a7f5537"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/copernik-eu/copernik-xml-factory"
}, {
"type" : "WEB",
"url" : "https://github.com/copernik-eu/copernik-xml-factory/releases/tag/v0.1.2"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-611" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-10-02T18:27:17Z",
"nvd_published_at" : null
}
}