VULNERABILITY INTELLIGENCE

CVE-2026-59903

CVSS score6.5 MEDIUM
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-08-17
Last modified2026-09-23
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-524

Primary references