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    CVE-2026-56853

    When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

    Published:Aug 13, 2026
    Last Modified:Aug 14, 2026
    EPS:Aug 13, 2026
    EPSS Score:0.0022
    CVSS Score:7.5

    Affected Products

    Vendor
    Go Standard Library
    Product
    Net/http

    Exploits

    No exploit reference

    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