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    CVE-2026-21874

    NiceGUI is a Python-based UI framework. From versions v2.10.0 to 3.4.1, an unauthenticated attacker can exhaust Redis connections by repeatedly opening and closing browser tabs on any NiceGUI application using Redis-backed storage. Connections are never released, leading to service degradation when Redis hits its connection limit. NiceGUI continues accepting new connections - errors are logged but the app stays up with broken storage functionality. This issue has been patched in version 3.5.0.

    Published:Jan 8, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 8, 2026
    EPSS Score:0.00026
    CVSS Score:5.3

    Affected Products

    Vendor
    Zauberzeug
    Product
    Nicegui

    Exploits

    https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

    Related CVEs

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    CVE-2026-33332 (CVSS 6.9) — NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_med…
    CVE-2026-27156 (CVSS 6.1) — NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on c…
    CVE-2026-25516 (CVSS 6.1) — NiceGUI is a Python-based UI framework. The ui.markdown() component uses the markdown2 library to convert mark…
    CVE-2026-25732 (CVSS 7.5) — NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supp…
    CVE-2026-21873 (CVSS 7.2) — NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushsta…
    CVE-2026-21872 (CVSS 6.1) — NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click e…
    CVE-2026-21871 (CVSS 6.1) — NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when dev…

    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