VDB
CVE-2026-39377
CVE-2026-39377
PUBLISHED
CVSS 6.5 MEDIUM
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.
EPSS 0.40% · 33.3th percentile
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS Score
0.40%
33.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| jupyter | nbconvert | * |
Timeline
- Apr 20, 2026 PoC Published
- Apr 21, 2026 CVE Published
- Apr 21, 2026 CVE Updated
- Apr 21, 2026 PoC Published
- Apr 29, 2026 Security Advisory
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score