Vulnerability Intelligence Report
Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes
CVE-2026-3298
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.
No Active Exploit Signals
CVSS Base Score
8.8
HIGH
EPSS Probability:0.39%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-787 ↗CWE-787 Out-of-bounds write
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Python Software Foundation | CPython | 0 < 3.11.16 (affected), 3.12.0 < 3.12.14 (affected), 3.13.0 < 3.13.14 (affected), 3.14.0a1 < 3.14.5rc1 (affected), 3.15.0a1 < 3.15.0b1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.392%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Python Software Foundation · Vendor · USA |
| Reserved | 2026-02-26T20:12:47 |
| Published | 2026-04-21T14:45:01 |
| Last Updated | 2026-08-13T00:27:55 |
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