CVE catalog

CVE-2026-39377

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Published: Apr 21, 2026, 12:14:59 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.27% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nbconvert	sid	`7.17.1-2`	fixed
Debian	nbconvert	forky	`7.17.1-2`	fixed
Debian	nbconvert	trixie	`7.16.6-1+deb13u1`	fixed
Debian	nbconvert	bookworm	`6.5.3-3`	not affected
Cpe	nbconvert	Not reported	`7.17.1`	fixed
PyPI	nbconvert	Not reported	`7.17.1`	fixed
PyPI	nbconvert	Not reported	`7.17.1`	fixed
Cpe	nbconvert	Not reported	`7.17.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nbconvert	source	sid	`7.17.1-1`	not yet assigned	Not reported	[1134889]
Debian	nbconvert	source	forky	`7.17.1-1`	not yet assigned	Not reported	[1134889]
Debian	nbconvert	source	trixie	`7.16.6-1+deb13u1`	not yet assigned	Not reported	[1134889]
Debian	nbconvert	source	bookworm	`Not affected`	unimportant	Not reported	[1134889]
Cpe	nbconvert	cpe	Not reported	`7.17.1`	Not reported	Not reported	Not reported
PyPI	nbconvert	PyPI	Not reported	`7.17.1`	Not reported	GHSA-4C99-QJ7H-P3VG	Not reported
PyPI	nbconvert	PyPI	Not reported	`7.17.1`	Not reported	PYSEC-2026-2229	Not reported
Cpe	nbconvert	cpe	Not reported	`7.17.1`	Not reported	NVD-CVE-2026-39377	Not reported

[Debian bug #1134889]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[jupyter-nbconvert]Not affected
Source package: [nbconvert]
Details (2)
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm
[python3-nbconvert]Not affected
Source package: [nbconvert]
Details (2)
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm
[python-nbconvert-doc]Not affected
Source package: [nbconvert]
Details (2)
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm
- 6.5.3-3 · all · bookworm
  Not affected
  nvd · nbconvert · debian · bookworm

[Debian 13 (Trixie)]

[jupyter-nbconvert]Fixed
Source package: [nbconvert]
Details (2)
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13
[python3-nbconvert]Fixed
Source package: [nbconvert]
Details (2)
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13
[python-nbconvert-doc]Fixed
Source package: [nbconvert]
Details (2)
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13
- 7.16.6-1+deb13u1 · all · trixie
  Fixed · Fixed: 7.16.6-1+deb13u1
  nvd · nbconvert · debian · 13

Observed: Oct 26, 2026, 10:27:46 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]