org.hl7.fhir.core: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint

All implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation. The utility intended to secure this evaluation did so incorrectly, and did not fully cover all places in which evaluation was being done. An attacker can send a resource...

PT-2026-41778

Name of the Vulnerable Software and Affected Versions FHIRPathEngine affected versions not specified Description Implementations of FHIRPathEngine evaluate arbitrary FHIRPath expressions without input validation. The functions matches, matchesFull, and replaceMatches pass user-controlled regular...