CVE-2026-15308

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"Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "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/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@python.org", "affectedData": [{"repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "modules": ["html.parser", "html"], "product": "CPython", "versions": [{"status": "affected", "version": "0", "lessThan": "3.10.21", "versionType": "python"}, {"status": "affected", "version": "3.11.0", "lessThan": "3.11.16", "versionType": "python"}, {"status": "affected", "version": "3.12.0", "lessThan": "3.12.14", "versionType": "python"}, {"status": "affected", "version": "3.13.0", "lessThan": "3.13.15", "versionType": "python"}, {"status": "affected", "version": "3.14.0", "lessThan": "3.14.7", "versionType": "python"}, {"status": "affected", "version": "3.15.0a1", "lessThan": "3.15.0b4", "versionType": "python"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-09T17:16:58.260", "references": [{"url": "https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/issues/153030", "tags": ["Patch"], "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/pull/153031", "tags": ["Issue Tracking", "Patch"], "source": "cna@python.org"}, {"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/", "tags": ["Mailing List"], "source": "cna@python.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/07/09/4", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cna@python.org", "description": [{"lang": "en", "value": "CWE-400"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data."}], "lastModified": "2026-08-20T17:02:59.313", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "35C0374F-6CC2-4546-8933-B382CD3A9225", "versionEndExcluding": "3.10.21"}, {"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D409E2A6-22F1-47D5-A273-4772BF45925E", "versionEndExcluding": "3.11.16", "versionStartIncluding": "3.11.0"}, {"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15B3E361-E948-4A55-A163-E681B8E0EF16", "versionEndExcluding": "3.12.14", "versionStartIncluding": "3.12.0"}, 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