CVE-2026-55471

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.10, org.hl7.fhir.utilities.XsltUtilities saxonTransform... overloads instantiated a bare net.sf.saxon.TransformerFactoryImpl without ACCESSEXTERNALDTD or ACCESSEXTERNALSTYLESHEET...

CVE-2026-55471

CVE-2026-55471 concerns HAPI FHIR’s XsltUtilities.sax(on)Transform overloads, which historically instantiate a bare net.sf.saxon.TransformerFactoryImpl() without external-access restrictions. This enables XML External Entity (XXE) processing, allowing local file disclosure and blind XXE/SSRF when...

HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory

Summary org.hl7.fhir.utilities.XsltUtilities exposes two parallel families of XSLT transform helpers. The transform... overloads obtain their TransformerFactory from the project's hardened helper XMLUtil.newXXEProtectedTransformerFactory which sets ACCESSEXTERNALDTD="" and...

PT-2026-50600

Name of the Vulnerable Software and Affected Versions org.hl7.fhir.utilities versions 6.9.8 and earlier Description The org.hl7.fhir.utilities library contains an XML External Entity XXE injection flaw. The saxonTransform function overloads instantiate a bare net.sf.saxon.TransformerFactoryImpl...