CVE-2026-44615: Apache Zeppelin: Path traversal in NotebookRepo note and folder path composition

[Jongyoul Lee <jongyoul () apache org>]

Severity: low 

Affected versions:

- Apache Zeppelin 0.9.0 before 0.12.1

Description:

Path traversal vulnerability in Apache Zeppelin. When FileSystemNotebookRepo is configured, an authenticated attacker 
with permission to rename a note, or access to folder operations, could supply traversal segments in note or folder 
paths. Zeppelin composed these values into filesystem paths using the server's filesystem or Hadoop identity without 
ensuring that the result remained under the configured notebook directory. This could allow notebook files or 
directories to be moved, written, or deleted outside the notebook root. This issue affects Apache Zeppelin versions 
0.9.0 through 0.12.0. Users are recommended to upgrade to version 0.12.1, which fixes this issue.

Credit:

Green-m (finder)

References:

https://github.com/apache/zeppelin/pull/5227
https://github.com/apache/zeppelin/pull/5248
https://zeppelin.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-44615