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

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

https://cvefeed.io/rssfeed/latest.atom / Tue, 04/21/2026 - 07:54
CVE ID :CVE-2026-39377
Published : April 21, 2026, 1:16 a.m. | 2 hours, 56 minutes ago
Description :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 `ExtractAttachmentsPreprocessor` passes attachment filenames directly to the filesystem without sanitization, enabling path traversal attacks. This vulnerability provides complete control over both the destination path and file extension. Version 7.17.1 contains a patch.
Severity: 6.5 | MEDIUM
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