JPA Server in HAPI FHIR before 5.4.0 allows a user to deny service (e.g., disable access to the database after the attack stops) via history requests. This occurs because of a SELECT COUNT statement that requires a full index scan, with an accompanying large amount of server resources if there are many simultaneous history requests.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| ca.uhn.hapi.fhir:hapi-fhir-jpaserver-base(Maven) | 0 | 5.4.0 | N/A |
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