{
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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-15308",
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "state": "PUBLISHED",
        "assignerShortName": "PSF",
        "dateReserved": "2026-07-09T17:04:11.926Z",
        "datePublished": "2026-07-09T17:10:57.317Z",
        "dateUpdated": "2026-08-13T00:28:26.690Z"
    },
    "containers": {
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                {
                    "defaultStatus": "unaffected",
                    "modules": [
                        "html.parser",
                        "html"
                    ],
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "vendor": "Python Software Foundation",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.10.21",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.11.0",
                            "lessThan": "3.11.16",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.12.0",
                            "lessThan": "3.12.14",
                            "status": "affected",
                            "versionType": "python"
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                            "version": "3.13.0",
                            "lessThan": "3.13.15",
                            "status": "affected",
                            "versionType": "python"
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                        {
                            "version": "3.14.0",
                            "lessThan": "3.14.7",
                            "status": "affected",
                            "versionType": "python"
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                        {
                            "version": "3.15.0a1",
                            "lessThan": "3.15.0b4",
                            "status": "affected",
                            "versionType": "python"
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                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Edward-x (https://github.com/YLChen-007)"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Serhiy Storchaka (https://github.com/serhiy-storchaka)"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "Gregory P. Smith (https://github.com/gpshead)"
                },
                {
                    "lang": "en",
                    "type": "coordinator",
                    "value": "Seth Larson (https://github.com/sethmlarson)"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data."
                        }
                    ],
                    "value": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data."
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "attackVector": "NETWORK",
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH",
                        "exploitMaturity": "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:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "HIGH",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
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                    "format": "CVSS",
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                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
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            ],
            "problemTypes": [
                {
                    "descriptions": [
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                            "cweId": "CWE-400",
                            "description": "CWE-400",
                            "lang": "en",
                            "type": "CWE"
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                    ]
                }
            ],
            "providerMetadata": {
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                "shortName": "PSF",
                "dateUpdated": "2026-08-13T00:28:26.690Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/pull/153031"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://github.com/python/cpython/issues/153030"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9"
                },
                {
                    "tags": [
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                    "url": "https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced"
                },
                {
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                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"
                },
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                    "url": "https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"
                },
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                    "url": "https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14"
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                    "url": "https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations",
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        },
        "adp": [
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                                "timestamp": "2026-07-09T17:31:19.781935Z",
                                "id": "CVE-2026-15308",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
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                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
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                ],
                "title": "CISA ADP Vulnrichment",
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-09T17:31:27.360Z"
                }
            },
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/07/09/4"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-07-09T19:32:36.790Z"
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}