{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.13.14"
              },
              {
                "introduced": "3.14.0"
              },
              {
                "fixed": "3.14.6"
              },
              {
                "introduced": "3.15.0a1"
              },
              {
                "fixed": "3.15.0b2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "ebf955df7a89ed0c7968f79faec1de49f61ed7cb"
            },
            {
              "introduced": "f31a89bb901067dd105b00cfa90523cf7ffdbbdd"
            },
            {
              "fixed": "fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"
            },
            {
              "fixed": "c63aec69bd59c55314c06c23f4c22c03de76fe45"
            },
            {
              "fixed": "94a64bbc6ce89644cf02b82c723d9cc37f6a1870"
            },
            {
              "fixed": "6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0"
            },
            {
              "fixed": "90748760d38ca3ac5fc6788a69becab905c95598"
            },
            {
              "fixed": "991224b1e8311c85f198f6dd8208bf8cff7fc26f"
            },
            {
              "fixed": "ba785b88add96acbf403d65cb157fb2743a33a32"
            },
            {
              "fixed": "c5512bd7c1dc28055660565275012766941d3066"
            }
          ],
          "repo": "https://github.com/python/cpython",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "PSF",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3276.json"
  },
  "details": "unicodedata.normalize() can take excessive CPU time when processing\nspecially crafted Unicode input containing long runs of combining characters\nwith alternating Canonical Combining Class values.\nThis affects all normalization forms.",
  "id": "CVE-2026-3276",
  "modified": "2026-07-08T05:36:20.111593532Z",
  "published": "2026-06-03T14:29:39.727Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/03/15"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3276.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3276"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/issues/149079"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/pull/149080"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python/cpython"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Potential DoS via quadratic complexity in unicodedata.normalize()"
}