{"cve":"CVE-2026-3298","nvd":{"published":"2026-04-21T15:16:37.047","modified":"2026-10-26T21:10:00.170","status":"Awaiting Analysis","description":"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.","cvss_v4":{"vector":"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","score":8.8},"cvss_v3":null,"cwes":["CWE-787"],"references":["https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d","https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2","https://github.com/python/cpython/commit/6c8b85b3f1d83d5697ec19880960e1eacee56688","https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741","https://github.com/python/cpython/commit/f5ca38739241fe7a40a4b116d5a8a1364dd6fea7"],"products":[],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-3298","score":0.00392,"percentile":0.33095,"date":"2026-10-26"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}