CVE-2026-39377 nbconvert has an Arbitrary File Write via Path Traversal in Cell Attachment Filenames

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The...

PT-2026-33878

Name of the Vulnerable Software and Affected Versions nbconvert versions 6.5 through 7.17.0 Description The nbconvert tool converts Jupyter notebooks to various formats using Jinja templates. A path traversal issue exists where the ExtractAttachmentsPreprocessor function passes attachment filenam...