Path Traversal in Jupyter Jupyter_server
CVE-2026-35397
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured root_dir and access sibling directories whose…
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.000 (13.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Jupyter Jupyter_server
- Jupyter-server Jupyter_server — versions < 2.18.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-5789-5fc7-67v3 (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-35397?
- CVE-2026-35397 is a high-severity vulnerability in Jupyter Jupyter_server, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-05-05.
- How severe is CVE-2026-35397?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-35397 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.