What is CVE-2026-55470?

CVE-2026-55470 is a high-severity vulnerability in Hapifhir Org.hl7.fhir.core, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-55470?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hapifhir Org.hl7.fhir.core

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.ds…

Vulnerability class: ReDoS (Regular Expression Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Hapifhir Org.hl7.fhir.core — versions < 6.9.10

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55470?: CVE-2026-55470 is a high-severity vulnerability in Hapifhir Org.hl7.fhir.core, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-55470?: High severity. CVSS v3 base score is 7.5 out of 10.