Bug 2505975 (CVE-2026-56817) - CVE-2026-56817 io.netty/netty-codec-xml: Netty: Information disclosure via XML External Entity (XXE) vulnerability
Summary: CVE-2026-56817 io.netty/netty-codec-xml: Netty: Information disclosure via XM...
Keywords:
Status: NEW
Alias: CVE-2026-56817
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 23:03 UTC by OSIDB Bzimport
Modified: 2026-08-13 14:51 UTC (History)
36 users (show)

Fixed In Version:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:54622 0 None None None 2026-08-13 14:51:36 UTC

Description OSIDB Bzimport 2026-07-21 23:03:29 UTC 
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 to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Comment 1 errata-xmlrpc 2026-08-13 14:51:33 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16

Via RHSA-2026:54622 https://access.redhat.com/errata/RHSA-2026:54622
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