HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java
Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: HAPI FHIR
PRODUCT: org.hl7.fhir.core
AFFECTED_VERSIONS: < 6.9.11
CONFIDENCE: high
MISSING: none
---END_METADATA---
Description Summary:
HAPI FHIR is vulnerable to improper input validation, which can lead to uncontrolled resource consumption and denial of service.
Executive Summary:
A high-severity vulnerability in HAPI FHIR related to improper input validation allows unauthenticated attackers to exhaust resources and cause a denial of service.
Vulnerability Details
CVE-ID: CVE-2026-62295
Affected Software: HAPI FHIR (org.hl7.fhir.core)
Affected Versions: All versions prior to 6.9.11
Vulnerability: This vulnerability involves improper input validation leading to uncontrolled resource consumption and uncontrolled recursion (CWE-20, CWE-400, CWE-674). An unauthenticated attacker can exploit this by submitting malicious input that forces the application into a resource-heavy recursive loop.
Business Impact
Exploitation of this vulnerability results in an effective denial of service, rendering the HAPI FHIR service unresponsive. Given the CVSS score of 7.5, this presents a severe risk to organizations relying on this library for critical health data interoperability, as downtime could disrupt essential information flows.
Remediation Plan
Immediate Action: Update all HAPI FHIR libraries, including core and validation modules, to version 6.9.11 to resolve the underlying input validation flaws.
Proactive Monitoring: Implement monitoring for high memory or CPU usage patterns that correlate with incoming API requests to identify potential exploitation attempts.
Compensating Controls: Deploy a Web Application Firewall or an API gateway configured to inspect and block malformed or excessively deep recursive FHIR requests.
Exploitation Status
Public Exploit Available: No (exploit_available: false)
Analyst Notes: As of August 9, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The vulnerability is inherent to the way the library handles complex recursive structures in input.
Analyst Recommendation
Immediate remediation via patching to version 6.9.11 is strongly advised. Organizations should treat this as a high-priority update to ensure the continued availability of services and to protect against potential denial of service attacks.