{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18503", "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22", "state": "PUBLISHED", "assignerShortName": "PSF", "dateReserved": "2026-07-31T16:35:42.902Z", "datePublished": "2026-08-10T13:45:31.618Z", "dateUpdated": "2026-08-10T14:23:30.257Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "modules": ["csv"], "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"version": "0", "lessThan": "3.13.15", "status": "affected", "versionType": "python"}, {"version": "3.14.0", "lessThan": "3.14.7", "status": "affected", "versionType": "python"}, {"version": "3.15.0a1", "lessThan": "3.15.0rc1", "status": "affected", "versionType": "python"}]}], "credits": [{"lang": "en", "type": "remediation developer", "value": "Serhiy Storchaka (https://github.com/serhiy-storchaka)"}, {"lang": "en", "type": "reporter", "value": "Jack Desert (https://github.com/jackdesert)"}, {"lang": "en", "type": "reporter", "value": "Sean Gilligan (https://github.com/sg3-141-592)"}, {"lang": "en", "type": "coordinator", "value": "Seth Larson (https://github.com/sethmlarson)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"type": "text/html", "value": "Attacker-controlled CSV samples can trigger super-linear \nregular-expression work during dialect sniffing and consume significant \nCPU when applications pass unbounded input to csv.Sniffer.sniff()."}], "value": "Attacker-controlled CSV samples can trigger super-linear \nregular-expression work during dialect sniffing and consume significant \nCPU when applications pass unbounded input to csv.Sniffer.sniff()."}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "baseScore": 2.4, "baseSeverity": "LOW", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1176", "description": "CWE-1176", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "28c92f92-d60d-412d-b760-e73465c3df22", "shortName": "PSF", "dateUpdated": "2026-08-10T14:23:30.257Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/pull/153694"}, {"tags": ["issue-tracking"], "url": "https://github.com/python/cpython/issues/98820"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b"}], "source": {"discovery": "UNKNOWN"}, "title": "Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()", "x_generator": {"engine": "cvelib 1.8.0"}}}}

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