{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-12254","assignerOrgId":"28c92f92-d60d-412d-b760-e73465c3df22","state":"PUBLISHED","assignerShortName":"PSF","dateReserved":"2024-12-05T16:17:55.154Z","datePublished":"2024-12-06T15:19:41.576Z","dateUpdated":"2025-04-04T23:03:00.653Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","modules":["asyncio"],"platforms":["MacOS","Linux"],"product":"CPython","repo":"https://github.com/python/cpython","vendor":"Python Software Foundation","versions":[{"version":"3.12.0","lessThan":"3.12.9","status":"affected","versionType":"python"},{"version":"3.13.0","lessThan":"3.13.2","status":"affected","versionType":"python"},{"version":"3.14.0a1","lessThan":"3.14.0a3","status":"affected","versionType":"python"}]}],"credits":[{"lang":"en","type":"reporter","value":"J. Nick Koston"},{"lang":"en","type":"coordinator","value":"Seth Larson"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<div>Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()\n method would not \"pause\" writing and signal to the Protocol to drain \nthe buffer to the wire once the write buffer reached the \"high-water \nmark\". Because of this, Protocols would not periodically drain the write\n buffer potentially leading to memory exhaustion.<br></div><div><br></div><div>This\n vulnerability likely impacts a small number of users, you must be using\n Python 3.12.0 or later, on macOS or Linux, using the asyncio module \nwith protocols, and using .writelines() method which had new \nzero-copy-on-write behavior in Python 3.12.0 and later. If not all of \nthese factors are true then your usage of Python is unaffected.</div><br>"}],"value":"Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()\n method would not \"pause\" writing and signal to the Protocol to drain \nthe buffer to the wire once the write buffer reached the \"high-water \nmark\". Because of this, Protocols would not periodically drain the write\n buffer potentially leading to memory exhaustion.\n\n\n\n\n\nThis\n vulnerability likely impacts a small number of users, you must be using\n Python 3.12.0 or later, on macOS or Linux, using the asyncio module \nwith protocols, and using .writelines() method which had new \nzero-copy-on-write behavior in Python 3.12.0 and later. If not all of \nthese factors are true then your usage of Python is unaffected."}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"28c92f92-d60d-412d-b760-e73465c3df22","shortName":"PSF","dateUpdated":"2025-02-04T20:38:34.082Z"},"references":[{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/127655"},{"tags":["patch"],"url":"https://github.com/python/cpython/pull/127656"},{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786"}],"source":{"discovery":"UNKNOWN"},"title":"Unbounded memory buffering in SelectorSocketTransport.writelines()","x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-770","lang":"en","description":"CWE-770 Allocation of Resources Without Limits or Throttling"}]}],"affected":[{"vendor":"python_software_foundation","product":"cpython","cpes":["cpe:2.3:a:python_software_foundation:cpython:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"3.12.0","status":"affected","lessThan":"3.14.0a1","versionType":"python"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-12-06T15:35:11.234951Z","id":"CVE-2024-12254","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-02-05T16:54:28.955Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2024/12/06/1"},{"url":"https://security.netapp.com/advisory/ntap-20250404-0010/"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-04-04T23:03:00.653Z"}}]}}