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    CVE-2026-55470

    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.

    Published:Jul 8, 2026
    Last Modified:Jul 16, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00374
    CVSS Score:7.5

    Affected Products

    Vendor
    Hapifhir
    Product
    Hl7 Fhir Core

    Exploits

    https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-62296 (CVSS 7.5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-62295 (CVSS 7.5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-62293 (CVSS 5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-49485 (CVSS 7.5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-45367 (CVSS 7.5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-55471 (CVSS 8.7) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-34361 (CVSS 9.3) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-34360 (CVSS 5.8) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-34359 (CVSS 7.4) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…
    CVE-2026-33180 (CVSS 7.5) — HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High