BIT-LIBPYTHON-2026-3298 Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes

The method "sockrecvfrominto" 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...

PSF-0000-CVE-2026-3298

The method "sockrecvfrominto" 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...

CVE-2026-3298

CVE-2026-3298 describes an out-of-bounds write in Windows-only asyncio.ProacterEventLoop.sock_recvfrom_into() when using the nbytes parameter. The root cause is a missing boundary check for the destination data buffer, enabling a write past the buffer size if incoming data exceeds it. Non-Windows...