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CVE-2026-55470

Hapifhir Hl7 Fhir Core vulnerability

7.5 HIGHPublic exploitEPSS 0.68%
  1. Published8 Jul 2026

Description

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.10, the fix for CVE-2026-45367 incompletely patched the DSTU2 module, leaving FHIRPathEngine.matches() in org.hl7.fhir.dstu2/utils/FHIRPathEngine.java to call raw String.matches(sw) without RegexTimeout protection while replaceMatches() was updated, allowing an unauthenticated attacker to trigger catastrophic regex backtracking and exhaust server CPU. This issue is fixed in version 6.9.10.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Hapifhir Hl7 Fhir Core< 6.9.10

Remediation

Fixed in
Hapifhir Hl7 Fhir Core≥ 6.9.10

References

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Frequently asked

Is CVE-2026-55470 being actively exploited?

CVE-2026-55470 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.68%.

How severe is CVE-2026-55470?

CVE-2026-55470 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.68% probability of exploitation.

Which products are affected by CVE-2026-55470?

Affected products include Hapifhir Hl7 Fhir Core.

How do I fix CVE-2026-55470?

Upgrade affected software to a fixed version, for example Hapifhir Hl7 Fhir Core 6.9.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.