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:
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Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-17 18:11 UTC by OSIDB Bzimport
Modified: 2026-08-31 21:48 UTC (History)
108 users (show)

Fixed In Version:
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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.
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