What is CVE-2026-5422?

CVE-2026-5422 is a high-severity vulnerability in Jupyter Jupyter/jupyter, classified under Relative Path Traversal. CVSS score: 8.1/10. Published 2026-06-02.

How severe is CVE-2026-5422?

High severity. CVSS v3 base score is 8.1 out of 10.

Path Traversal in Jupyter Jupyter/jupyter

CVE-2026-5422

A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) with…

EPSS: 0.000 (9.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Jupyter Jupyter/jupyter — versions unspecified
Jupyter Jupyter_server — versions 2.17.0

Weakness classification (CWE)

CWE-23 — Relative Path Traversal

References

security@huntr.dev (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5422?: CVE-2026-5422 is a high-severity vulnerability in Jupyter Jupyter/jupyter, classified under Relative Path Traversal. CVSS score: 8.1/10. Published 2026-06-02.
How severe is CVE-2026-5422?: High severity. CVSS v3 base score is 8.1 out of 10.