CVE-2026-34360

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.4, the /loadIG HTTP endpoint in the FHIR Validator HTTP service accepts a user-supplied URL via JSON body and makes server-side HTTP requests to it without any hostname, scheme, or domain validation. An unauthenticated attacker with network access to the validator can probe internal network services, cloud metadata endpoints, and map network topology through error-based information leakage. With explore=true (the default for this code path), each request triggers multiple outbound HTTP calls, amplifying reconnaissance capability. This issue has been patched in version 6.9.4.

The following products are affected by CVE-2026-34360 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34360.

URL	Resource
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3ww8-jw56-9f5h