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.
Published: 2026-04-21
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Out-of-bounds write leading to memory corruption that could enable arbitrary code execution or crash
Action: Apply Patch
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Remediation

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History

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 21 Apr 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Tue, 21 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 8.8, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-05-12T13:25:15.388Z

Reserved: 2026-02-26T20:12:47.041Z

Link: CVE-2026-3298

cve-icon Vulnrichment

Updated: 2026-04-21T19:15:41.466Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-21T15:16:37.047

Modified: 2026-04-21T21:16:41.937

Link: CVE-2026-3298

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-21T23:00:03Z

Weaknesses