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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-56817US | critical9.8 | — | ||
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 ca… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/netty/nettyPACKAGE
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bWEB
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6WEB
- https://github.com/netty/netty/releases/tag/netty-4.1.136.FinalWEB
- https://github.com/netty/netty/releases/tag/netty-4.2.16.FinalWEB
- https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfxWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-56817ADVISORY
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