FKIE_CVE-2026-39377

Vulnerability from fkie_nvd - Published: 2026-04-21 01:16 - Updated: 2026-10-26 22:10
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/jupyter/nbconvert/releases/tag/v7.17.1Product
security-advisories@github.comhttps://github.com/jupyter/nbconvert/security/advisories/GHSA-4c99-qj7h-p3vgMitigation, Vendor Advisory
Impacted products
Vendor Product Version
jupyter nbconvert *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nbconvert",
          "vendor": "jupyter",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.5, \u003c 7.17.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:jupyter:nbconvert:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "B8ACC92D-6ED7-40BE-917E-5527F6746B60",
              "versionEndExcluding": "7.17.1",
              "versionStartIncluding": "6.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "La herramienta nbconvert, jupyter nbconvert, convierte cuadernos Jupyter a varios otros formatos a trav\u00e9s de plantillas Jinja. Las versiones 6.5 hasta la 7.17.0 permiten escrituras de archivos arbitrarias a ubicaciones fuera del directorio de salida previsto al procesar cuadernos que contienen nombres de archivo de adjuntos de celda manipulados. El \u2019ExtractAttachmentsPreprocessor\u2019 pasa los nombres de archivo de los adjuntos directamente al sistema de archivos sin saneamiento, lo que permite ataques de salto de ruta. Esta vulnerabilidad proporciona control completo tanto sobre la ruta de destino como sobre la extensi\u00f3n del archivo. La versi\u00f3n 7.17.1 contiene un parche."
    }
  ],
  "id": "CVE-2026-39377",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-39377",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-21T16:01:22.179013Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T01:16:05.937",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/jupyter/nbconvert/releases/tag/v7.17.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/jupyter/nbconvert/security/advisories/GHSA-4c99-qj7h-p3vg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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