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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Hapifhir Hl7_Fhir_Core
cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*
|
— |
6.9.10
|
References 3
https://github.com/hapifhir/org.hl7.fhir.core/commit/56376f7986222626af061ca7fc…
security-advisories@github.com
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10
security-advisories@github.com
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9x…
security-advisories@github.com