Dashboard / CVE-2026-39378

CVE-2026-39378

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 Conf. Impact

CVSS Vector Breakdown

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

Description

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. In versions 6.5 through 7.17.0, when `HTMLExporter.embed_images=True`, nbconvert's markdown renderer allows arbitrary file read via path traversal in image references. A malicious notebook can exfiltrate sensitive files from the conversion host by embedding them as base64 data URIs in the output HTML. nbconvert 7.17.1 contains a fix. As a workaround, do not enable `HTMLExporter.embed_images`; it is not enabled by default.

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:H/I:N/A:N

EPSS — Exploitation Probability

0.31%
Raw Score 0.003060
Percentile 23.4%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00306
2026-10-28
0.00306

Intelligence Sources

nvd ref →

External Links