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vuln-cve/data/2026/3xxx/CVE-2026-3298.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-3298",
"assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
"state": "PUBLISHED",
"assignerShortName": "PSF",
"dateReserved": "2026-02-26T20:12:47.041Z",
"datePublished": "2026-04-21T14:45:01.919Z",
"dateUpdated": "2026-08-13T00:27:55.667Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "CPython",
"repo": "https://github.com/python/cpython",
"vendor": "Python Software Foundation",
"versions": [
{
"version": "0",
"lessThan": "3.11.16",
"status": "affected",
"versionType": "python"
},
{
"version": "3.12.0",
"lessThan": "3.12.14",
"status": "affected",
"versionType": "python"
},
{
"version": "3.13.0",
"lessThan": "3.13.14",
"status": "affected",
"versionType": "python"
},
{
"version": "3.14.0a1",
"lessThan": "3.14.5rc1",
"status": "affected",
"versionType": "python"
},
{
"version": "3.15.0a1",
"lessThan": "3.15.0b1",
"status": "affected",
"versionType": "python"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "GGAutomaton (https://github.com/GGAutomaton)"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Victor Stinner (https://github.com/vstinner)"
},
{
"lang": "en",
"type": "coordinator",
"value": "Seth Larson (https://github.com/sethmlarson)"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"type": "text/html",
"value": "The method \"sock_recvfrom_into()\" of \"asyncio.ProacterEventLoop\" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer write if data was larger than the buffer size. Non-Windows platforms are not affected."
}
],
"value": "The method \"sock_recvfrom_into()\" of \"asyncio.ProacterEventLoop\" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer write if data was larger than the buffer size. Non-Windows platforms are not affected."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.8,
"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:L/VI:L/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
"shortName": "PSF",
"dateUpdated": "2026-08-13T00:27:55.667Z"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/pull/148809"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/python/cpython/issues/148808"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/6c8b85b3f1d83d5697ec19880960e1eacee56688"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/f5ca38739241fe7a40a4b116d5a8a1364dd6fea7"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes",
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-04-21T19:15:36.206348Z",
"id": "CVE-2026-3298",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"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": "2026-04-21T19:15:44.557Z"
}
}
]
}
}