CVE-2026-12993 Apicurio/apicurio-registry: apicurio-registry: xml entity-expansion denial of service via internal dtd subset

A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURESECUREPROCESSING. An attacker with artifact-write permission can upload XML documents with internal entity-expansion payloa...