CVE-2026-34360
MediumCVSS 5.8Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
HAPI FHIR prior to version 6.9.4 has a /loadIG HTTP endpoint in the FHIR Validator HTTP service that accepts a user-supplied URL via JSON body and makes server-side HTTP requests without hostname, scheme, or domain validation. An unauthenticated attacker with network access can probe internal network services, cloud metadata endpoints, and map network topology through error-based information leakage.
Risk Assessment
An attacker can gain information about internal network infrastructure, which could lead to further attacks and security breaches.
Recommendation
Upgrade HAPI FHIR to version 6.9.4, which contains the fix.
Original NVD description (English source)
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.