ubuntu-cve-2026-39378
Vulnerability from osv_ubuntu
Published
2026-04-21 01:16
Modified
2026-05-20 15:27
Summary
Details

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.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "5.3.1-1"
          },
          {
            "binary_name": "python-nbconvert",
            "binary_version": "5.3.1-1"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "5.3.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@5.3.1-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.2.0-4",
        "5.3.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "5.6.1-1"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "5.6.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@5.6.1-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4-2ubuntu2",
        "5.6.0-1",
        "5.6.0-2",
        "5.6.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "6.4.0-1"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "6.4.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@6.4.0-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.6.1-3",
        "6.1.0-1",
        "6.3.0-1",
        "6.4.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "6.5.3-5"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "6.5.3-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@6.5.3-5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.5.3-4",
        "6.5.3-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "7.16.6-1"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "7.16.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@7.16.6-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.16.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyter-nbconvert",
            "binary_version": "7.17.0-1"
          },
          {
            "binary_name": "python3-nbconvert",
            "binary_version": "7.17.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nbconvert",
        "purl": "pkg:deb/ubuntu/nbconvert@7.17.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.16.6-1",
        "7.17.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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\u0027s 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.",
  "id": "UBUNTU-CVE-2026-39378",
  "modified": "2026-05-20T15:27:25Z",
  "published": "2026-04-21T01:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39378"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-39378"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-39378"
  ]
}



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