Bug 2517538 (CVE-2026-59903) - CVE-2026-59903 io.netty/netty: Netty: Information disclosure via CORS Vary header overwrite
Summary: CVE-2026-59903 io.netty/netty: Netty: Information disclosure via CORS Vary he...
Keywords:
Status: NEW
Alias: CVE-2026-59903
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-17 18:11 UTC by OSIDB Bzimport
Modified: 2026-11-06 15:33 UTC (History)
117 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:86676 0 None None None 2026-10-21 07:35:05 UTC
Red Hat Product Errata RHSA-2026:92056 0 None None None 2026-10-28 17:52:58 UTC
Red Hat Product Errata RHSA-2026:92057 0 None None None 2026-10-28 17:52:31 UTC
Red Hat Product Errata RHSA-2026:92059 0 None None None 2026-10-28 17:51:47 UTC
Red Hat Product Errata RHSA-2026:95221 0 None None None 2026-11-04 14:45:06 UTC
Red Hat Product Errata RHSA-2026:95887 0 None None None 2026-11-06 15:33:16 UTC

Description OSIDB Bzimport 2026-08-17 18:11:59 UTC 
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
Comment 1 Jon Orris 2026-10-21 07:35:00 UTC 
This issue has been addressed in the following products:

  Streams for Apache Kafka 3.2.2

Via RHSA-2026:86676 https://access.redhat.com/errata/RHSA-2026:86676
Comment 2 Jon Orris 2026-10-28 17:51:40 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

Via RHSA-2026:92059 https://access.redhat.com/errata/RHSA-2026:92059
Comment 3 Jon Orris 2026-10-28 17:52:25 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

Via RHSA-2026:92057 https://access.redhat.com/errata/RHSA-2026:92057
Comment 4 Jon Orris 2026-10-28 17:52:52 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

Via RHSA-2026:92056 https://access.redhat.com/errata/RHSA-2026:92056
Comment 5 Jon Orris 2026-11-04 14:45:00 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:95221 https://access.redhat.com/errata/RHSA-2026:95221
Comment 6 Jon Orris 2026-11-06 15:33:09 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:95887 https://access.redhat.com/errata/RHSA-2026:95887
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