Dashboard / CVE-2026-39377

CVE-2026-39377

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 63/100
Published: 2026-04-21 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Required
S: Unchanged
C: None
I: High
A: None

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.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
jupyter nbconvert 6.5.0 – 7.17.1

References & Advisories (2)

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS — Exploitation Probability

0.27%
Raw Score 0.002660
Percentile 18.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00266
2026-10-28
0.00266

Intelligence Sources

nvd ref →

External Links