CVE-2026-55471 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55471HIGH

hapifhir org.hl7.fhir.core — HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   N   N    8.7   .0038   30.9     —

AFFECTED
  Product            Versions    Fixed
  org.hl7.fhir.core  < 6.9.10 –  —

TIMELINE
  Jun 16  Reserved by GitHub_M
  Jul 8   EXPLOIT PUBLISHED — CVE-2026-55471 (hapifhir org.hl7.fhir.core). Public exploit reference added.
  Jul 8   Published (CNA: GitHub_M)

CWE-611 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 16, 2026	Reserved	Reserved by GitHub_M
July 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55471 (hapifhir org.hl7.fhir.core). Public exploit reference added.
July 8, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
hapifhir	org.hl7.fhir.core	—	< 6.9.10	—

Weaknesses

CWE-611

References (3)

https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe78af8c0dc52298 [Patch]
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10 [Release Notes]
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-55471 at cve.org

Vendors: hapifhir

Weaknesses: CWE-611

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55471 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.