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...

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...