FKIE_CVE-2025-8291

Vulnerability from fkie_nvd - Published: 2025-10-07 18:16 - Updated: 2026-10-08 22:10
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Summary
The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the 'zipfile' module compared to other ZIP implementations. Remediation maintains this behavior, but checks that the offset specified in the ZIP64 EOCD Locator record matches the expected value.
References
cna@python.orghttps://github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267
cna@python.orghttps://github.com/python/cpython/commit/1d29afb0d6218aa8fb5e1e4a6133a4778d89bb46
cna@python.orghttps://github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6
cna@python.orghttps://github.com/python/cpython/commit/76437ac248ad8ca44e9bf697b02b1e2241df2196
cna@python.orghttps://github.com/python/cpython/commit/8392b2f0d35678407d9ce7d95655a5b77de161b4
cna@python.orghttps://github.com/python/cpython/commit/bca11ae7d575d87ed93f5dd6a313be6246e3e388
cna@python.orghttps://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3
cna@python.orghttps://github.com/python/cpython/issues/139700
cna@python.orghttps://github.com/python/cpython/pull/139702
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.json
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
            {
              "lessThan": "3.9.24",
              "status": "affected",
              "version": "0",
              "versionType": "python"
            },
            {
              "lessThan": "3.10.19",
              "status": "affected",
              "version": "3.10.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.11.14",
              "status": "affected",
              "version": "3.11.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.12.12",
              "status": "affected",
              "version": "3.12.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.13.10",
              "status": "affected",
              "version": "3.13.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.14.1",
              "status": "affected",
              "version": "3.14.0",
              "versionType": "python"
            }
          ]
        }
      ],
      "source": "cna@python.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The \u0027zipfile\u0027 module would not check the validity of the ZIP64 End of\nCentral Directory (EOCD) Locator record offset value would not be used to\nlocate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be\nassumed to be the previous record in the ZIP archive. This could be abused\nto create ZIP archives that are handled differently by the \u0027zipfile\u0027 module\ncompared to other ZIP implementations.\n\n\nRemediation maintains this behavior, but checks that the offset specified\nin the ZIP64 EOCD Locator record matches the expected value."
    },
    {
      "lang": "es",
      "value": "El m\u00f3dulo \u0027zipfile\u0027 no verificar\u00eda la validez del valor de desplazamiento del registro localizador del Fin del Directorio Central (EOCD) ZIP64, y este valor no se usar\u00eda para localizar el registro EOCD ZIP64; en su lugar, se asumir\u00eda que el registro EOCD ZIP64 es el registro anterior en el archivo ZIP. Esto podr\u00eda ser abusado para crear archivos ZIP que son manejados de manera diferente por el m\u00f3dulo \u0027zipfile\u0027 en comparaci\u00f3n con otras implementaciones ZIP.\n\nLa remediaci\u00f3n mantiene este comportamiento, pero verifica que el desplazamiento especificado en el registro localizador EOCD ZIP64 coincide con el valor esperado."
    }
  ],
  "id": "CVE-2025-8291",
  "lastModified": "2026-10-08T22:10:00.563",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-8291",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-10-29T15:15:06.403842Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-07T18:16:00.317",
  "references": [
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/1d29afb0d6218aa8fb5e1e4a6133a4778d89bb46"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/76437ac248ad8ca44e9bf697b02b1e2241df2196"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/8392b2f0d35678407d9ce7d95655a5b77de161b4"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/bca11ae7d575d87ed93f5dd6a313be6246e3e388"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/issues/139700"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/pull/139702"
    },
    {
      "source": "cna@python.org",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.json"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1285"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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