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CVE-2025-4435

Status: DeferredHigh (7.5)—

When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Python — TarfileAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2025-4435",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-4435",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-03T13:58:00.099450Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cna@python.org",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cna@python.org",
      "affectedData": [
        {
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "modules": [
            "tarfile"
          ],
          "product": "CPython",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.9.23",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "3.10.0",
              "lessThan": "3.10.18",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "3.11.0",
              "lessThan": "3.11.13",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "3.12.0",
              "lessThan": "3.12.11",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "3.13.0",
              "lessThan": "3.13.4",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "3.14.0a1",
              "lessThan": "3.14.0b3",
              "versionType": "python"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-06-03T13:15:20.630",
  "references": [
    {
      "url": "https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/issues/135034",
      "source": "cna@python.org"
    },
    {
      "url": "https://github.com/python/cpython/pull/135037",
      "source": "cna@python.org"
    },
    {
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/",
      "source": "cna@python.org"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-682"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped."
    },
    {
      "lang": "es",
      "value": "Al usar TarFile.errorlevel = 0 y extraer con un filtro, el comportamiento documentado es que cualquier miembro filtrado se omite y no se extrae. Sin embargo, el comportamiento real de TarFile.errorlevel = 0 en las versiones afectadas es que el miembro se extrae y no se omite."
    }
  ],
  "lastModified": "2026-07-31T14:16:44.653",
  "sourceIdentifier": "cna@python.org"
}