Bug 2567839 (CVE-2026-61586)

Summary: CVE-2026-61586 eu.copernik/copernik-xml-factory: Copernik XML Factory: Information disclosure via unrestricted XInclude resource resolution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Copernik XML Factory. When an application enables XML Inclusions (XInclude) while using the stock Java Development Kit (JDK) parser, the library fails to restrict external resource resolution. A remote attacker can exploit this flaw by submitting crafted XML input containing malicious include references. Successful exploitation primarily results in information disclosure through the unauthorized reading of local files, and may also permit the attacker to reach internal network endpoints via server-side request forgery (SSRF).
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Description OSIDB Bzimport 2026-11-05 22:30:16 UTC 
Copernik XML Factory provides secure-by-default JAXP factory creation for Java. Prior to 0.1.2, Copernik XML Factory does not block XInclude resource resolution on the stock JDK provider after an application enables XInclude on a factory returned by `XmlFactories.newDocumentBuilderFactory()` or `XmlFactories.newSAXParserFactory()`, or on an `XMLReader` passed through `XmlFactories.harden()`. An application parsing untrusted XML can resolve attacker-controlled `xi:include` references to disclose local files or, through `http` references, reach internal network endpoints by server-side request forgery. Exploitation requires use of one of those factory/hardening APIs, the stock JDK provider with Apache Xerces absent from the classpath, explicit `setXIncludeAware(true)` or the equivalent reader feature, and XML from an untrusted source. The Xerces provider selected when Xerces is present and the Android provider are unaffected. This issue is fixed in version 0.1.2.