CVE-2026-3298
8.8
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | 3.11.0 < 3.13.14 | affected |
| Python Software Foundation | CPython | 3.14.0a1 < 3.14.5rc1 | affected |
| Python Software Foundation | CPython | 3.15.0a1 < 3.15.0b1 | affected |
Weaknesses
- CWE-787: CWE-787 Out-of-bounds write
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/python/cpython/pull/148809
- https://github.com/python/cpython/issues/148808
- https://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/
- https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d
- https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2
- https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741
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