{"id":"BIT-python-2026-3298","summary":"Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes","details":"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.","aliases":["BIT-libpython-2026-3298","BIT-python-min-2026-3298","CVE-2026-3298","PSF-2026-20"],"modified":"2026-08-19T09:45:25.864612631Z","published":"2026-07-06T15:27:55.061Z","database_specific":{"cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"WEB","url":"https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d"},{"type":"WEB","url":"https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2"},{"type":"WEB","url":"https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741"},{"type":"WEB","url":"https://github.com/python/cpython/issues/148808"},{"type":"WEB","url":"https://github.com/python/cpython/pull/148809"},{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3298"},{"type":"WEB","url":"https://github.com/python/cpython/commit/6c8b85b3f1d83d5697ec19880960e1eacee56688"},{"type":"WEB","url":"https://github.com/python/cpython/commit/f5ca38739241fe7a40a4b116d5a8a1364dd6fea7"}],"affected":[{"package":{"name":"python","ecosystem":"Bitnami","purl":"pkg:bitnami/python"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.11.16"},{"introduced":"3.12.0"},{"fixed":"3.12.14"},{"introduced":"3.13.0"},{"fixed":"3.13.14"},{"introduced":"3.14.0"},{"fixed":"3.14.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/python/BIT-python-2026-3298.json"},"severity":[{"type":"CVSS_V4","score":"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/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"}]}],"schema_version":"1.9.0"}