CVE-2026-55470

CVE-2026-55470 affects the DSTU2 module of HAPI FHIR (org.hl7.fhir.dstu2) where FHIRPathEngine.matches() still uses raw String.matches(sw) with no RegexTimeout, enabling unauthenticated attackers to trigger catastrophic regex backtracking and exhaust CPU. The issue is resolved by upgrading to 6.9...

CVE-2026-55470 HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

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.matchessw...