CVE-2026-56817: Netty XML: Injection / Risky Sink — unconfigured XML factory with active DTD and entity handling

Any caller that can deliver bytes to a Netty channel pipeline containing XmlDecoder can send XML with a DOCTYPE declaration to a parser instantiated with no security configuration — but whether external entities are actually resolved depends on Aalto XML’s async parser behavior, making this a confirmed misconfiguration with conditional exploitability.