FKIE_CVE-2026-7774

Vulnerability from fkie_nvd - Published: 2026-06-04 16:16 - Updated: 2026-08-13 01:16
Severity
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.
References
cna@python.orghttps://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2
cna@python.orghttps://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d
cna@python.orghttps://github.com/python/cpython/commit/10a13bee3c24f9c62b602e696334ff2272a40efc
cna@python.orghttps://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117da
cna@python.orghttps://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558
cna@python.orghttps://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbf
cna@python.orghttps://github.com/python/cpython/commit/c063191cb7f9170f9565e305f8aa2b79ab2bf609
cna@python.orghttps://github.com/python/cpython/issues/149486
cna@python.orghttps://github.com/python/cpython/pull/149487
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/06/04/9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "tarfile"
          ],
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
            {
              "lessThan": "3.10.21",
              "status": "affected",
              "version": "0",
              "versionType": "python"
            },
            {
              "lessThan": "3.11.16",
              "status": "affected",
              "version": "3.11.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.12.14",
              "status": "affected",
              "version": "3.12.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.13.14",
              "status": "affected",
              "version": "3.13.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.14.6",
              "status": "affected",
              "version": "3.14.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.15.0b2",
              "status": "affected",
              "version": "3.15.0a1",
              "versionType": "python"
            }
          ]
        }
      ],
      "source": "cna@python.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process."
    },
    {
      "lang": "es",
      "value": "tarfile.data_filter podr\u00eda ser eludido utilizando entradas de enlace manipuladas, incluyendo enlaces simb\u00f3licos con nombres vac\u00edos o similares a directorios, para redirigir miembros posteriores del archivo fuera del directorio de extracci\u00f3n previsto. Esto permit\u00eda que un archivo tar malicioso causara que tarfile.extractall() escribiera archivos fuera del directorio de destino, sujeto a los permisos del proceso de extracci\u00f3n."
    }
  ],
  "id": "CVE-2026-7774",
  "lastModified": "2026-08-13T01:16:55.783",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-7774",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-04T17:27:23.917872Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-04T16:16:42.103",
  "references": [
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/10a13bee3c24f9c62b602e696334ff2272a40efc"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117da"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbf"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/c063191cb7f9170f9565e305f8aa2b79ab2bf609"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/issues/149486"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/pull/149487"
    },
    {
      "source": "cna@python.org",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/04/9"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "cna@python.org",
      "type": "Secondary"
    }
  ]
}



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