Answer in brief
CVE-2026-55471 records a Critical severity (CVSS 9.1) vulnerability in HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory. The current sources do not mark it as known exploited. The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.utilities (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.utilities (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| hapifhir/org.hl7.fhir.coregeneric | < 6.9.10 | Not reported |
| ca.uhn.hapi.fhir:org.hl7.fhir.utilitiesmaven | <=6.9.9 | 6.9.10 |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.