CVE-2026-35397: Jupyter Server: Path Traversal via incorrect startswith() root directory check allows access to sibling directories

May 5, 2026 (updated May 8, 2026)

Jupyter Server <=2.17.0 can access directories sibling to the root directory, if it starts with the root dir’s name.

References

github.com/advisories/GHSA-5789-5fc7-67v3
github.com/jupyter-server/jupyter_server
github.com/jupyter-server/jupyter_server/security/advisories/GHSA-5789-5fc7-67v3
nvd.nist.gov/vuln/detail/CVE-2026-35397

Code Behaviors & Features

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