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    CVE-2026-54338

    JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior to 5.5.0, invalid input to form-based login authenticators can place an unbounded attacker-controlled username in failed-login logs, allowing an unauthenticated attacker to consume logging and storage resources. This issue is fixed in version 5.5.0.

    Published:Aug 7, 2026
    Last Modified:Aug 11, 2026
    EPS:Aug 7, 2026
    EPSS Score:0.00282
    CVSS Score:5.3

    Affected Products

    Vendor
    Jupyterhub
    Product
    Jupyterhub

    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