How severe is CVE-2026-34360?

CVE-2026-34360 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-34360 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34360?

CVE-2026-34360 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34360?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34360 have an EU (EUVD) identifier?

Yes. CVE-2026-34360 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17526.

When was CVE-2026-34360 published?

CVE-2026-34360 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34360

CVE-2026-34360 is a medium-severity vulnerability in Hapifhir Hl7 Fhir Core with a CVSS 3.x base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17526
Weakness: CWE-918
Affected product: Hapifhir Hl7 Fhir Core
Published: 2026-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-34360?: CVE-2026-34360 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-34360 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34360?: CVE-2026-34360 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34360?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34360 have an EU (EUVD) identifier?: Yes. CVE-2026-34360 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17526.
When was CVE-2026-34360 published?: CVE-2026-34360 was published on 2026-03-31 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*

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