CVE-2026-56817 Netty: XML External Entity (XXE) injection via unconfigured XML factory when DTD and entity processing are enabled

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing XmlDecoder can send XML with a DOCTYPE declaration...

CVE-2026-56817

Netty CVE-2026-56817 affects Netty versions 4.2.0.Final–4.2.15.Final and 4.1.0.Final–4.1.135.Final, where any caller delivering bytes to a channel pipeline containing XmlDecoder can send XML with a DOCTYPE to an AsyncXMLInputFactory started without security configuration, leaving DTD/entity handl...