CVE-2026-47712 (GCVE-0-2026-47712)

Vulnerability from cvelistv5 – Published: 2026-06-10 22:01 – Updated: 2026-06-11 12:42
VLAI
Title
Dulwich doesn't sanitize commit subjects in `porcelain.format_patch`
Summary
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's 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's 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's first line contains /, \, .., or other characters that are not safe on the target filesystem.
Severity
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version
jelmer dulwich Affected: >= 0.24.0, < 1.2.5
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47712",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-11T12:41:02.775185Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-11T12:42:40.209Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dulwich",
          "vendor": "jelmer",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.24.0, \u003c 1.2.5"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-10T22:01:49.996Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f"
        },
        {
          "name": "https://github.com/jelmer/dulwich/commit/c2446e51b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jelmer/dulwich/commit/c2446e51b"
        },
        {
          "name": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5"
        }
      ],
      "source": {
        "advisory": "GHSA-555p-6grf-mh7f",
        "discovery": "UNKNOWN"
      },
      "title": "Dulwich doesn\u0027t sanitize commit subjects in `porcelain.format_patch`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-47712",
    "datePublished": "2026-06-10T22:01:49.996Z",
    "dateReserved": "2026-05-19T21:29:25.481Z",
    "dateUpdated": "2026-06-11T12:42:40.209Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-47712",
      "date": "2026-08-10",
      "epss": "0.00139",
      "percentile": "0.0367"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-47712\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-06-10T23:16:48.650\",\"lastModified\":\"2026-07-21T19:10:00.107\",\"vulnStatus\":\"Deferred\",\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"jelmer\",\"product\":\"dulwich\",\"versions\":[{\"version\":\"\u003e= 0.24.0, \u003c 1.2.5\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N\",\"baseScore\":3.3,\"baseSeverity\":\"LOW\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.8,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-11T12:41:02.775185Z\",\"id\":\"CVE-2026-47712\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"references\":[{\"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\",\"source\":\"security-advisories@github.com\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-10T14:00:38+00:00",
      "cve": "CVE-2026-47712",
      "id": "CVE-2026-47712",
      "initial_release_date": "2026-06-10T22:01:49.996000+00:00",
      "product_status:known_affected": "24",
      "product_status:under_investigation": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "dulwich: Dulwich: Arbitrary file write via malicious commit subject in format_patch",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47712.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-06-12T02:25:27Z",
      "cve": "CVE-2026-47712",
      "id": "CVE-2026-47712",
      "initial_release_date": "2026-06-12T02:25:27Z",
      "product_status:known_not_affected": "24",
      "product_status:recommended": "3",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-47712",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-47712.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Dulwich doesn\u0027t sanitize commit subjects in `porcelain.format_patch`\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-22\", \"lang\": \"en\", \"description\": \"CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV3_1\": {\"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\"}}], \"references\": [{\"name\": \"https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f\"}, {\"name\": \"https://github.com/jelmer/dulwich/commit/c2446e51b\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/jelmer/dulwich/commit/c2446e51b\"}, {\"name\": \"https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5\"}], \"affected\": [{\"vendor\": \"jelmer\", \"product\": \"dulwich\", \"versions\": [{\"version\": \"\u003e= 0.24.0, \u003c 1.2.5\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-10T22:01:49.996Z\"}, \"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.\"}], \"source\": {\"advisory\": \"GHSA-555p-6grf-mh7f\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-47712\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-11T12:41:02.775185Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T12:41:33.222Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-47712\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-05-19T21:29:25.481Z\", \"datePublished\": \"2026-06-10T22:01:49.996Z\", \"dateUpdated\": \"2026-06-11T12:42:40.209Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.