user-readable api tokens in systemd units
Priority LOW 35CWE-668Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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
Why it matters now
EPSS 0.0048 41st percentileScored 2026-11-07
Fix Fixed systemdspawner (jupyterhub): 0.15jupyterhub-systemdspawner (PyPI): 0.15.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| jupyterhub | systemdspawner | before 0.15 | 0.15 | Patch available | CNA |
| — | jupyterhub-systemdspawner (PyPI) | before 0.15.0 | 0.15.0 | Patch available | GHSA-cg54-gpgr-4rm6 |
- systemdspawner Vendorjupyterhub Affected before 0.15 Fixed in 0.15 Patch available CNA
- jupyterhub-systemdspawner (PyPI) Vendor— Affected before 0.15.0 Fixed in 0.15.0 Patch available GHSA-cg54-gpgr-4rm6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:jupyterhub:systemdspawner:*:*:*:*:*:*:*:* | before 0.15 | Vulnerable | jupyterhub |
- cpe:2.3:a:jupyterhub:systemdspawner:*:*:*:*:*:*:*:* Versions before 0.15 Vulnerable ·jupyterhub
Remediation
- Fix · CNA systemdspawner (jupyterhub) Fixed in 0.15
- Fix · GHSA-cg54-gpgr-4rm6 jupyterhub-systemdspawner (PyPI) Fixed in 0.15.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26261
- 2026-10-03 Alias added: GHSA-cg54-gpgr-4rm6
References
Advisory 4
Sources
- CVE-2020-26261 · CVE Program
- CVE-2020-26261 · NVD
- FIRST EPSS
- GHSA-cg54-gpgr-4rm6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences