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.

How to fix CVE-2024-12254

To remediate CVE-2024-12254, upgrade the affected package to a fixed version below.

• —upgrade to 3.12.8-r1 or later
• —upgrade to 3.12.9 or later
• —upgrade to 3.12.9 or later
• —upgrade to 3.12.9 or later
• —upgrade to 3.13.1-2 or later

Is CVE-2024-12254 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (5)

• from 0, < 3.12.8-r1
• >= 3.12.0, < 3.12.9, >= 3.13.0, < 3.13.2
• >= 3.12.0, < 3.12.9, >= 3.13.0, < 3.13.2
• >= 3.12.0, < 3.12.9, >= 3.13.0, < 3.13.2
• from 0, < 3.13.1-2

CVSS scores

References (11)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2024-12254
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2024-12254
• WEBgithub.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82
• WEBgithub.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5