Vulnerabilities CVE-2026-59903

CVE-2026-59903

Medium

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 6.5
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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