# CVE-2024-3219: Pure-Python fallback of socket.socketpair() doesn’t authenticate peer connection

CVE-2024-3219 is fixed in Python 3.12 on 1 platform by Python 3.12 3.12.5 (version 3.12.5), released August 6, 2024. 8 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-3219
- Priority: Routine
- CVSS: 5.1
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2024
- Weakness: CWE-306: Missing Authentication for Critical Function
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2024-3219

## Description

The  “socket” module provides a pure-Python fallback to the  socket.socketpair() function for platforms that don’t support AF_UNIX,  such as Windows. This pure-Python implementation uses AF_INET or  AF_INET6 to create a local connected pair of sockets. The connection  between the two sockets was not verified before passing the two sockets  back to the user, which leaves the server socket vulnerable to a  connection race from a malicious local peer.  Platforms that support AF_UNIX such as Linux and macOS are not affected by this vulnerability. Versions prior to CPython 3.5 are not affected due to the vulnerable API not being included.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.12 | 3.12.5 | [Python 3.12 3.12.5](https://patchblox.com/security/data/fix/windows-app/python.python.3.12-3.12.5.md) | Aug 6, 2024 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Python 2 | no-fix |
| Windows apps | Python 3.10 | no-fix |
| Windows apps | Python 3.11 | no-fix |
| Windows apps | Python 3.5 | no-fix |
| Windows apps | Python 3.6 | no-fix |
| Windows apps | Python 3.7 | no-fix |
| Windows apps | Python 3.8 | no-fix |
| Windows apps | Python 3.9 | no-fix |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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