CVE-2026-39377

MEDIUM EPSS 18.0%
Published Apr 21, 20262mo ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Apr 21, 2026 2mo ago
Last Modified Jun 17, 2026 2w 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.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
18.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-22 Path Traversal Resource Mgmt
CWE-73

Affected Products 1

VendorProductVersionRange
jupyternbconvert*≥6.5.0  –  <7.17.1

References 2

  • github.com https://github.com/jupyter/nbconvert/releases/tag/v7.17.1
    Product
  • github.com https://github.com/jupyter/nbconvert/security/advisories/GHSA-4c99-qj7h-p3vg
    MitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.