Bug 2498310 (CVE-2026-55471)

Summary: CVE-2026-55471 ca.uhn.hapi.fhir/org.hl7.fhir.utilities: HAPI FHIR XsltUtilities: XML External Entity injection allows local file disclosure and SSRF
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anujha, asoldano, bbaranow, bmaxwell, bstansbe, dlofthou, fmongiar, istudens, ivassile, iweiss, janstey, jnethert, mosmerov, msvehla, nwallace, pberan, pesilva, pjindal, pmackay, rstancel, thjenkin, vdosoudi
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the HAPI FHIR `XsltUtilities` component. The `saxonTransform` functions within this utility do not adequately restrict external entity access when processing XML. This oversight allows an attacker, who can control or tamper with the XML data being transformed, to inject malicious XML External Entities (XXE). Successful exploitation can lead to local file disclosure, enabling the attacker to read sensitive files from the system. Additionally, it can result in Server-Side Request Forgery (SSRF), where the attacker can force the system to make requests to arbitrary network resources, potentially exposing internal network information or cloud metadata.
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Description OSIDB Bzimport 2026-07-08 22:03:21 UTC 
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 ACCESS_EXTERNAL_DTD or ACCESS_EXTERNAL_STYLESHEET restrictions, allowing an attacker who controls or can tamper with transformed XML to trigger XML External Entity injection for local file disclosure and blind XXE or SSRF to arbitrary URLs reachable from the host. This issue is fixed in version 6.9.10.
Comment 3 errata-xmlrpc 2026-08-13 23:28:32 UTC 
This issue has been addressed in the following products:

  Red Hat Build of Apache Camel 4.18 for Quarkus 3.33

Via RHSA-2026:54776 https://access.redhat.com/errata/RHSA-2026:54776