CVE-2026-59903

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.

• CWE-524

• https://github.com/netty/netty/pull/17213Issue Tracking, Patch
• https://github.com/netty/netty/pull/17217Issue Tracking, Patch
• https://github.com/netty/netty/releases/tag/netty-4.1.137.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.17.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46Vendor Advisory

Published

Aug 17, 2026

Last Modified

Sep 23, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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