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    CVE-2026-50052

    In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync attack (request smuggling), which in turn can be used for cache poisoning, authentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the feature parameter to contain +http2. HTTP/2 support is disabled by default.

    Published:Jun 3, 2026
    Last Modified:Jun 5, 2026
    EPS:Jun 3, 2026
    EPSS Score:0.00083
    CVSS Score:2.3

    Affected Products

    Vendor
    The Vinyl Cache Project
    Product
    Varnish Cache (pre Split)
    Vendor
    The Vinyl Cache Project
    Product
    Vinyl Cache
    Vendor
    Varnish Software
    Product
    Varnish Cache By Varnish Software

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    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