CVE-2026-12993
Description
A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING. An attacker with artifact-write permission can upload XML documents with internal entity-expansion payloads (billion-laughs variant) that cause CPU and heap exhaustion, partially mitigated by the JAXP default 64,000 entity-expansion limit.
Summary dbcve.org
Apicurio Registry's DocumentBuilderAccessor blocks external DTD and schema access but fails to disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING, allowing authenticated attackers with artifact-write permission to upload XML documents containing internal entity-expansion payloads (Billion Laughs variant) that exhaust CPU and heap memory.
Mitigation
Enable FEATURE_SECURE_PROCESSING and explicitly disable DOCTYPE declarations in the DocumentBuilderFactory configuration to prevent XML entity expansion attacks.