{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "07efb08123ba9367a7107325adb9d5626dca1ca9"
            },
            {
              "fixed": "7933f4bf7131aa4140750f9404f5de0aa2969ced"
            },
            {
              "fixed": "bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"
            },
            {
              "fixed": "e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"
            }
          ],
          "repo": "https://github.com/python/cpython",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "PSF",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15308.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "3.15.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data.",
  "id": "CVE-2026-15308",
  "modified": "2026-07-12T03:55:08.360491414Z",
  "published": "2026-07-09T17:10:57.317Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/09/4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15308.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15308"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/issues/153030"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python/cpython/pull/153031"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python/cpython"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations"
}