CVE-2026-34360 HAPI FHIR: Unauthenticated Blind SSRF via /loadIG Endpoint Enables Internal Network Probing
Unauthenticated attackers can exploit the /loadIG endpoint to perform Server-Side Request Forgery, probing internal networks and cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34360?
CVE-2026-34360 is a medium-severity server-side request forgery vulnerability in hapifhir org.hl7.fhir.core, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-34360?
2 open source packages ship an affected version, including ca.uhn.hapi.fhir:org.hl7.fhir.core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ca.uhn.hapi.fhir:org.hl7.fhir.core Maven | All versions | 6.9.4 |
ca.uhn.hapi.fhir:org.hl7.fhir.core Maven | All versions | 6.9.4 |
Products include Hapifhir Hl7 Fhir Core.
How do I fix CVE-2026-34360?
Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.core to 6.9.4 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-34360 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34360 exists.
Other vulnerabilities in hapifhir org.hl7.fhir.core
- CVE-2026-34361 HAPI FHIR: Unauthenticated SSRF via /loadIG Chains with startsWith() Credential Leak for Authentication Token Theft
- CVE-2026-55471 HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory
- CVE-2023-24057 MITM based Zip Slip in `ca.uhn.hapi.fhir:org.hl7.fhir.core`
- CVE-2026-55470 HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS
- CVE-2023-28465 HL7 FHIR Partial Path Zip Slip due to bypass of CVE-2023-24057
Sources
Also known as GHSA-3ww8-jw56-9f5h, ROOT-APP-MAVEN-CVE-2026-34360.