high7.5
CVE-2026-55470
HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 | <= 6.9.9 | 6.9.10 |
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.convertors | <= 6.9.9 | 6.9.10 |
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.validation | <= 6.9.9 | 6.9.10 |
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli | <= 6.9.9 | 6.9.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Hapifhir | Hl7 Fhir Core | before 6.9.10 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fxj4-p9xp-37v5
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5
- https://github.com/hapifhir/org.hl7.fhir.core/commit/56376f7986222626af061ca7fc27ee1ab030e590
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10