Summary
A high-severity out-of-bounds write vulnerability (CVE-2026-3298) in Python's asyncio module on Windows allows remote attackers to cause memory corruption or execute arbitrary code. The flaw affects Python versions 3.11 through 3.14 and requires immediate patching or code-level mitigations.
Take Action:
If you're running Python applications on Windows (versions 3.11 through 3.14) that use asyncio for network communication, upgrade to the latest patched Python version as soon as it's available. Until then, avoid using the sock_recvfrom_into() method with untrusted network traffic, and watch for unexpected crashes on your Windows Python servers.
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This article was originally published on BeyondMachines
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