nbconvert Path Traversal Vulnerabilities

Arbitrary file write in Jupyter nbconvert 6.5 through 7.17.0 allows unauthenticated attackers to write files to arbitrary filesystem locations outside the intended output directory by crafting malicious cell attachment filenames in notebooks. The ExtractAttachmentsPreprocessor fails to sanitize attachment filenames, enabling path traversal that provides full control over destination paths and file extensions. Requires user interaction (opening a malicious notebook) and is patched in version 7.17.1.

Jupyter nbconvert 6.5 through 7.17.0 allows unauthenticated remote attackers to read arbitrary files from the conversion host when HTMLExporter.embed_images is enabled, by embedding malicious image references with path traversal sequences in a crafted notebook. A malicious actor can exfiltrate sensitive files as base64-encoded data URIs in the output HTML, achieving confidentiality breach with no integrity or availability impact. Vendor-released patch: version 7.17.1.