CVE-2026-55470

A flaw was found in HAPI FHIR, a Java implementation of the HL7 FHIR standard. The fix for a previous vulnerability CVE-2026-45367 was incomplete in the DSTU2 module. Specifically, the FHIRPathEngine.matches function in org.hl7.fhir.dstu2 did not include protection against regular expression...

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...

ca.uhn.hapi.fhir:hapi-fhir-base-test-jaxrsserver-kotlin (>=5.6.5 <=6.8.0), ca.uhn.hapi.fhir:hapi-fhir-cli-api (>=4.0.0 <=8.8.1) +258 more potentially affected by CVE-2026-55470 via ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (>=0.0.1 <=6.9.1)

ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 MAVEN version =0.0.1, =5.6.5, =4.0.0, =5.6.5, =4.1.0, =4.0.3, =4.1.0, =4.0.0, =4.0.0, =5.0.0, =4.0.0, =5.3.0, =6.2.0, =5.1.0, =6.8.0, =6.4.0, =8.8.1 and more Source cves: CVE-2026-55470 Source advisory: OSV:GHSA-FXJ4-P9XP-37V5...

HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

Summary The fix for CVE-2026-45367 added RegexTimeout protection to the matches function in DSTU2016MAY, DSTU3, R4, R4B, and R5, but the DSTU2 module was incompletely patched. In org.hl7.fhir.dstu2, replaceMatches was updated while matches at line 2462 still calls the raw String.matchessw without...

HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

The fix for CVE-2026-45367 added RegexTimeout protection to the matches function in DSTU2016MAY, DSTU3, R4, R4B, and R5, but the DSTU2 module was incompletely patched. In org.hl7.fhir.dstu2, replaceMatches was updated while matches at line 2462 still calls the raw String.matchessw without any...