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Vulnerability record · CVE-2026-3298 · published 21 April 2026

CVE-2026-3298: Out-of-bounds write vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.60% · top 53.3% CWE-787 · Out-of-bounds write Awaiting Analysis
8.8CVSS 4.0 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
13 Aug 2026Last modified by NVD

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: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:

References

LinkTags
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
https://github.com/python/cpython/issues/148808
https://github.com/python/cpython/pull/148809
https://mail.python.org/archives/list/[email protected]/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/

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Source: NIST National Vulnerability Database (record CVE-2026-3298), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.