---
id: CVE-2025-61765
title: >-
  python-socketio is a Python implementation of the Socket.IO realtime client
  and server
summary: >-
  python-socketio is a Python implementation of the Socket.IO realtime client
  and server. A remote code execution vulnerability in python-socketio versions
  prior to 5.14.0 allows attackers to execute arbitrary Python code through
  malicious…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-502
vendor: python-socketio
product: python-socketio
affected:
  - 'python-socketio >= 0.8.0, < 5.14.0'
patched:
  - python-socketio 5.14.0
published: '2025-10-06'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T10:10:00.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-61765'
references:
  - url: >-
      https://github.com/miguelgrinberg/python-socketio/commit/53f6be094257ed81476b0e212c8cddd6d06ca39a
    label: security-advisories@github.com
  - url: >-
      https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-g8c6-8fjj-2r4m
    label: security-advisories@github.com
  - url: >-
      https://www.bluerock.io/post/cve-2025-61765-bluerock-discovers-critical-rce-in-socket-io-ecosystem
    label: security-advisories@github.com
  - url: >-
      https://www.bluerock.io/post/cve-2025-61765-bluerock-discovers-critical-rce-in-socket-io-ecosystem
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-61765'
  - url: 'https://github.com/miguelgrinberg/python-socketio'
tags:
  - nvd
  - exploit-available
  - osv
  - pip
epss: 0.00482
epssPercentile: 0.41355
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/locus-x64/CVE-2025-61765_PoC'
  checkedAt: '2026-10-27T16:48:09.416Z'
exploitAvailable: true
aliases:
  - GHSA-g8c6-8fjj-2r4m
  - PYSEC-2026-1854
ecosystem: pip
ingestedAt: '2026-07-08T18:25:49.673Z'
---

## Overview

python-socketio is a Python implementation of the Socket.IO realtime client and server. A remote code execution vulnerability in python-socketio versions prior to 5.14.0 allows attackers to execute arbitrary Python code through malicious pickle deserialization in multi-server deployments on which the attacker previously gained access to the message queue that the servers use for internal communications. When Socket.IO servers are configured to use a message queue backend such as Redis for inter-server communication, messages sent between the servers are encoded using the `pickle` Python module. When a server receives one of these messages through the message queue, it assumes it is trusted and immediately deserializes it. The vulnerability stems from deserialization of messages using Python's `pickle.loads()` function. Having previously obtained access to the message queue, the attacker can send a python-socketio server a crafted pickle payload that executes arbitrary code during deserialization via Python's `__reduce__` method. This vulnerability only affects deployments with a compromised message queue. The attack can lead to the attacker executing random code in the context of, and with the privileges of a Socket.IO server process. Single-server systems that do not use a message queue, and multi-server systems with a secure message queue are not vulnerable. In addition to making sure standard security practices are followed in the deployment of the message queue, users of the python-socketio package can upgrade to version 5.14.0 or newer, which remove the `pickle` module and use the much safer JSON encoding for inter-server messaging.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2025-61765)

Affected packages:

- `python-socketio >= 0.8.0, < 5.14.0`

Patched in:

- `python-socketio 5.14.0`

Source: https://osv.dev/vulnerability/GHSA-g8c6-8fjj-2r4m