Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()
 method would not "pause" writing and signal to the Protocol to drain 
the buffer to the wire once the write buffer reached the "high-water 
mark". Because of this, Protocols would not periodically drain the write
 buffer potentially leading to memory exhaustion.





This
 vulnerability likely impacts a small number of users, you must be using
 Python 3.12.0 or later, on macOS or Linux, using the asyncio module 
with protocols, and using .writelines() method which had new 
zero-copy-on-write behavior in Python 3.12.0 and later. If not all of 
these factors are true then your usage of Python is unaffected.

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-400

CWE-770

https://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82

https://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5

https://github.com/python/cpython/issues/127655

https://github.com/python/cpython/pull/127656

https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/