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CVE-2026-59903

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-59903

Severity

6.5

Medium

CVSS V3

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Summary

Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite

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.

References

Affected packages

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