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CVE-2024-12254 Detail

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  Python Software Foundation
CVSS-B 8.7 HIGH
Vector:  CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2024/12/06/1
https://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82
https://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5
https://github.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786
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/

Weakness Enumeration

CWE-ID CWE Name Source
CWE-770 Allocation of Resources Without Limits or Throttling CISA-ADP   Python Software Foundation  
CWE-400 Uncontrolled Resource Consumption Python Software Foundation  

Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-12254
NVD Published Date:
12/06/2024
NVD Last Modified:
02/03/2025
Source:
Python Software Foundation