fkie_cve-2025-4516
Vulnerability from fkie_nvd
Published
2025-05-15 14:15
Modified
2025-06-03 14:15
Severity ?
5.9 (Medium) - CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
There is an issue in CPython when using `bytes.decode("unicode_escape", error="ignore|replace")`. If you are not using the "unicode_escape" encoding or an error handler your usage is not affected. To work-around this issue you may stop using the error= handler and instead wrap the bytes.decode() call in a try-except catching the DecodeError.
References
cna@python.orghttps://github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292
cna@python.orghttps://github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429d
cna@python.orghttps://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142
cna@python.orghttps://github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431f
cna@python.orghttps://github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77
cna@python.orghttps://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e
cna@python.orghttps://github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598b
cna@python.orghttps://github.com/python/cpython/issues/133767
cna@python.orghttps://github.com/python/cpython/pull/129648
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/05/16/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/05/19/1
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "There is an issue in CPython when using `bytes.decode(\"unicode_escape\", error=\"ignore|replace\")`. If you are not using the \"unicode_escape\" encoding or an error handler your usage is not affected. To work-around this issue you may stop using the error= handler and instead wrap the bytes.decode() call in a try-except catching the DecodeError."
    },
    {
      "lang": "es",
      "value": "Hay un problema en CPython al usar `bytes.decode(\"unicode_escape\", error=\"ignore|replace\")`. Si no usa la codificaci\u00f3n \"unicode_escape\" ni un controlador de errores, su uso no se ve afectado. Para solucionar este problema, puede dejar de usar el controlador `error=` y, en su lugar, encapsular la llamada `bytes.decode()` en un `try-except` que capture el `DecodeError`."
    }
  ],
  "id": "CVE-2025-4516",
  "lastModified": "2025-06-03T14:15:49.697",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.9,
          "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": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-05-15T14:15:31.753",
  "references": [
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429d"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431f"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598b"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/issues/133767"
    },
    {
      "source": "cna@python.org",
      "url": "https://github.com/python/cpython/pull/129648"
    },
    {
      "source": "cna@python.org",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/05/16/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/05/19/1"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "cna@python.org",
      "type": "Secondary"
    }
  ]
}


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