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Medium severity6.5NVD Advisory· Published Aug 17, 2026· Updated Sep 23, 2026

CVE-2026-59903

CVE-2026-59903

Description

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.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Final, < 4.2.17.Final4.2.17.Final
io.netty:netty-codec-httpMaven
< 4.1.137.Final4.1.137.Final

Affected products

290

Patches

Vulnerability mechanics

References

6

News mentions

0

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