CVE-2026-34360 json
HAPI FHIR: Unauthenticated Blind SSRF via /loadIG Endpoint Enables Internal Network Probing
published 2026-03-30 7 mo ago modified 2026-07-24 3 mo ago also GHSA-3ww8-jw56-9f5h , EUVD-2026-17526
- cvss
- 5.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven ca.uhn.hapi.fhir:org.hl7.fhir.core 6.9.4
- hapifhir hl7_fhir_core 6.9.4
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3ww8-jw56-9f5h referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
| GitHub | 3.1 | 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.core | <6.9.4 |
6.9.4 |
Affected products
- hapifhir org.hl7.fhir.core
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3ww8-jw56-9f5h
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34360
advisory
-
github.com
/hapifhir/org.hl7.fhir.core
package
Sources
- CVE List CVE-2026-34360
- GitHub Advisory GHSA-3ww8-jw56-9f5h
- NVD CVE-2026-34360
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