{
  "affected": [
    {
      "affectedData": [
        {
          "product": "dulwich",
          "vendor": "jelmer",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.24.0, \u003c 1.2.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.24.0 and prior to version 1.2.5, dulwich.porcelain.format_patch(outdir=...) derives each patch filename from the commit\u0027s subject line. Prior to this fix, get_summary only replaced spaces with dashes - path separators (/, \\), parent-directory components (..), and other filename-hostile characters (e.g. :) were preserved verbatim and passed straight into os.path.join(outdir, f\"{i:04d}-{summary}.patch\"). A malicious commit subject could therefore direct the generated patch file outside the requested outdir. This is fixed in Dulwich 1.2.5. Users should upgrade to 1.2.5 or later. dulwich.patch.get_summary now mirrors git\u0027s format_sanitized_subject: only `[A-Za-z0-9._]` are kept, runs of other characters collapse to a single -, consecutive . collapse to a single ., trailing ./- are stripped, and the result is length-limited. This makes the returned string safe to embed as a filename component, so format_patch can no longer be steered out of outdir via the commit subject. Until upgrading, callers that pass untrusted commits to   porcelain.format_patch can use stdout=True and write the patch to a destination they control, rather than letting format_patch choose the filename; validate the chosen path before opening - e.g. compare os.path.realpath(returned_path) against  os.path.realpath(outdir) and reject any patch whose resolved path is not inside outdir; and/or pre-screen commits and refuse to format any whose subject\u0027s first line contains /, \\, .., or other characters that are not safe on the target filesystem."
    },
    {
      "lang": "es",
      "value": "Dulwich es una implementaci\u00f3n puramente en Python de los formatos de archivo y protocolos de Git. A partir de la versi\u00f3n 0.24.0 y antes de la versi\u00f3n 1.2.5, dulwich.porcelain.format_patch(outdir=...) deriva cada nombre de archivo de parche de la l\u00ednea de asunto del commit. Antes de esta correcci\u00f3n, get_summary solo reemplazaba los espacios con guiones - los separadores de ruta (/, \\), los componentes de directorio padre (..), y otros caracteres hostiles para nombres de archivo (p. ej. :) se conservaban textualmente y se pasaban directamente a os.path.join(outdir, f\"{i:04d}-{summary}.patch\"). Un asunto de commit malicioso podr\u00eda, por lo tanto, dirigir el archivo de parche generado fuera del outdir solicitado. Esto se corrige en Dulwich 1.2.5. Los usuarios deber\u00edan actualizar a la versi\u00f3n 1.2.5 o posterior. dulwich.patch.get_summary ahora refleja el format_sanitized_subject de git: solo se mantienen \u0027[A-Za-z0-9._]\u0027, las secuencias de otros caracteres se colapsan a un solo -, los puntos consecutivos se colapsan a un solo ., los ./- finales se eliminan, y el resultado tiene una longitud limitada. Esto hace que la cadena devuelta sea segura para incrustar como un componente de nombre de archivo, por lo que format_patch ya no puede ser dirigido fuera de outdir a trav\u00e9s del asunto del commit. Hasta que se actualice, los llamadores que pasan commits no confiables a porcelain.format_patch pueden usar stdout=True y escribir el parche en un destino que controlen, en lugar de dejar que format_patch elija el nombre de archivo; validar la ruta elegida antes de abrir - p. ej. comparar os.path.realpath(returned_path) con os.path.realpath(outdir) y rechazar cualquier parche cuya ruta resuelta no est\u00e9 dentro de outdir; y/o pre-filtrar commits y negarse a formatear cualquiera cuya primera l\u00ednea del asunto contenga /, \\, .., u otros caracteres que no sean seguros en el sistema de archivos de destino."
    }
  ],
  "id": "CVE-2026-47712",
  "lastModified": "2026-07-21T19:10:00.107",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 3.3,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47712",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-11T12:41:02.775185Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-10T23:16:48.650",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jelmer/dulwich/commit/c2446e51b"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}