Bug 2459952 (CVE-2026-39378) - CVE-2026-39378 nbconvert: nbconvert: Sensitive file exfiltration via path traversal in image references
Summary: CVE-2026-39378 nbconvert: nbconvert: Sensitive file exfiltration via path tra...
Keywords:
Status: NEW
Alias: CVE-2026-39378
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-21 02:01 UTC by OSIDB Bzimport
Modified: 2026-04-22 20:16 UTC (History)
14 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-04-21 02:01:59 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.