FKIE_CVE-2026-7210

Vulnerability from fkie_nvd - Published: 2026-05-11 18:16 - Updated: 2026-06-17 11:02
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
References
cna@python.orghttps://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4Patch
cna@python.orghttps://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566Patch
cna@python.orghttps://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27aPatch
cna@python.orghttps://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145fPatch
cna@python.orghttps://github.com/python/cpython/issues/149018Issue Tracking
cna@python.orghttps://github.com/python/cpython/pull/149023Issue Tracking, Patch
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/05/11/13Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/05/11/8Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
python python *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "xml",
            "expat"
          ],
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
            {
              "lessThan": "3.13.14",
              "status": "affected",
              "version": "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"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "43B0671A-35BB-4EE4-8A68-E79B62A75547",
              "versionEndExcluding": "3.15.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch."
    }
  ],
  "id": "CVE-2026-7210",
  "lastModified": "2026-06-17T11:02:00.563",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "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:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-7210",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-11T18:53:57.884366Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-11T18:16:42.413",
  "references": [
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/python/cpython/issues/149018"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/python/cpython/pull/149023"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/05/11/13"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/05/11/8"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-331"
        }
      ],
      "source": "cna@python.org",
      "type": "Secondary"
    }
  ]
}


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