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CVE-2024-12254

Description

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.

POC

Reference

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

Github

- https://github.com/GitHubForSnap/matrix-commander-gael

- https://github.com/adegoodyer/kubernetes-admin-toolkit

- https://github.com/bygregonline/devsec-fastapi-report