CVE-2026-45367: Hapifhir org.hl7.fhir.core

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.

Affected products

• Hapifhir org.hl7.fhir.core: before 6.9.7 (fixed in 6.9.7)

Published 2026-07-16. Last modified 2026-07-18.