{"id":"CVE-2020-26261","aliases":["GHSA-cg54-gpgr-4rm6","PYSEC-2020-52"],"url":"https://o3.security/vulnerability/CVE-2020-26261","summary":"user-readable api tokens in systemd units for JupyterHub","details":"### Impact\nuser API tokens issued to single-user servers are specified in the environment of systemd units, which are accessible to all users.\n\nIn particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default.\n\n### Patches\nPatched in jupyterhub-systemdspawner v0.15\n\n### Workarounds\nNo workaround other than upgrading systemdspawner to 0.15\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open a thread in [the Jupyter forum](https://discourse.jupyter.org)\n* Email us at [security@ipython.org](mailto:security@ipython.org)","published":"2020-12-09T17:15:30.603Z","modified":"2026-07-09T02:49:40.089432Z","cvss":{"score":7.9,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyterhub-systemdspawner","fixedVersion":"0.15.0"}],"fix":{"url":"https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580","label":"jupyterhub/systemdspawner@a4d08fd"},"references":[{"type":"ADVISORY","url":"https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015"},{"type":"ADVISORY","url":"https://github.com/jupyterhub/systemdspawner/security/advisories/GHSA-cg54-gpgr-4rm6"},{"type":"FIX","url":"https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580"},{"type":"PACKAGE","url":"https://pypi.org/project/jupyterhub-systemdspawner/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26261"},{"type":"PACKAGE","url":"https://github.com/jupyterhub/systemdspawner"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-systemdspawner/PYSEC-2020-52.yaml"},{"type":"WEB","url":"https://pypi.org/project/jupyterhub-systemdspawner"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T02:49:40.089432Z"}}