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    CVE-2026-59903

    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.

    Published:Aug 17, 2026
    Last Modified:Aug 17, 2026
    EPS:Aug 17, 2026
    EPSS Score:0.00395
    CVSS Score:6.5

    Affected Products

    Vendor
    Netty
    Product
    Netty

    Exploits

    https://github.com/xiaoqiMikko/netty-http-check

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-204 Lifting Sensitive Data Embedded in Cache

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High