CVE-2020-26261

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    CVE-2020-26261

    Published: 9 Dec 2020Last Modified: 9 Jul 2026

    Summary:

    Details: jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15

    References: https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015, https://github.com/jupyterhub/systemdspawner/security/advisories/GHSA-cg54-gpgr-4rm6, https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580, https://pypi.org/project/jupyterhub-systemdspawner/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -7d7cf42db76d9cfa5a4bc42fff14943877ac570b

    Affected versions

    0.14.0

    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
    CVE-2020-26261 | CVE-DB