GHSA-4c99-qj7h-p3vg

Suggest an improvement
Source
https://github.com/advisories/GHSA-4c99-qj7h-p3vg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4c99-qj7h-p3vg/GHSA-4c99-qj7h-p3vg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4c99-qj7h-p3vg
Aliases
Downstream
Published
2026-04-21T17:18:18Z
Modified
2026-09-10T03:51:00Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Summary
nbconvert has an Arbitrary File Write via Path Traversal in Cell Attachment Filenames
Details

Arbitrary File Write via Path Traversal in Cell Attachment Filenames

Summary

nbconvert allows 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.

Impact

This vulnerability allows writing files with arbitrary content to arbitrary filesystem locations, limited only by the permissions of the process running nbconvert. The attacker controls:

  • Full destination path (via ../ traversal)
  • Filename
  • File extension
  • File content

Patches

  • upgrade to nbconvert v7.17.1

Workarounds

disable ExtractAttachmentsPreprocessor by setting:

c. ExtractAttachmentsPreprocessor.enabled = False
Database specific 
{
    "cwe_ids": [
        "CWE-22",
        "CWE-73"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T17:18:18Z",
    "nvd_published_at": "2026-04-21T01:16:05Z",
    "severity": "MODERATE"
}
References

Affected packages

PyPI / nbconvert

Package

Name
nbconvert
View open source insights on deps.dev
Purl
pkg:pypi/nbconvert

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.5.0
Fixed
7.17.1

Affected versions

6.*
6.5.0
6.5.1
6.5.2
6.5.3
6.5.4
7.*
7.0.0rc0
7.0.0rc1
7.0.0rc2
7.0.0rc3
7.0.0
7.1.0
7.2.0
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
7.2.7
7.2.8
7.2.9
7.2.10
7.3.0
7.3.1
7.4.0
7.5.0
7.6.0
7.7.0
7.7.1
7.7.2
7.7.3
7.7.4
7.8.0
7.9.0
7.9.1
7.9.2
7.10.0
7.11.0
7.12.0
7.13.0
7.13.1
7.14.0
7.14.1
7.14.2
7.15.0
7.16.0
7.16.1
7.16.2
7.16.3
7.16.4
7.16.5
7.16.6
7.17.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4c99-qj7h-p3vg/GHSA-4c99-qj7h-p3vg.json"