eap8-netty: Netty is an asynchronous, event-driven network application framework
CVE-2026-59903 is fixed in 5 products on 1 platform, first by RHSA-2026:92059, released August 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| eap8-netty · RHEL 10 | 4.1.138-1.Final_redhat_00001.1.el10eap | RHSA-2026:92059 | Aug 17, 2026 |
| eap8-netty-transport-native-epoll · RHEL 10 | 4.1.138-1.Final_redhat_00001.1.el10eap | RHSA-2026:92059 | Aug 17, 2026 |
| eap8-resteasy · RHEL 10 | 6.2.19-1.Final_redhat_00002.1.el10eap | RHSA-2026:92059 | Aug 17, 2026 |
| netty · sles 15.7 | 4.1.138-150200.4.56.1 | SUSE-SU-2026:4391-1 | Sep 29, 2026 |
| netty-tcnative · sles 15.6 | 2.0.84-150200.3.51.1 | SUSE-SU-2026:4391-1 | Sep 29, 2026 |
| netty-tcnative · sles 15.7 | 2.0.84-150200.3.51.1 | SUSE-SU-2026:4391-1 | Sep 29, 2026 |
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