Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hapifhir | Hl7 Fhir Core | < 6.9.10 |
Related Weaknesses (CWE)
References
- https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe7Patch
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10Release Notes
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35jExploitThird Party Advisory
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35jExploitThird Party Advisory
FAQ
What is CVE-2026-55471?
CVE-2026-55471 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 instantiate...
How severe is CVE-2026-55471?
CVE-2026-55471 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55471?
Check the references section above for vendor advisories and patch information. Affected products include: Hapifhir Hl7 Fhir Core.