{"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","slug":"CVE-2025-61765","body":"## Overview\n\npython-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2025-61765)\n\nAffected packages:\n\n- `python-socketio >= 0.8.0, < 5.14.0`\n\nPatched in:\n\n- `python-socketio 5.14.0`\n\nSource: https://osv.dev/vulnerability/GHSA-g8c6-8fjj-2r4m","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":4849,"id":"CVE-2025-61765","ts":1788887211820,"field":"exploit_available","old":"false","new":"true"},{"seq":3732,"id":"CVE-2025-61765","ts":1788886328341,"field":"exploit_available","old":"true","new":"false"},{"seq":2577,"id":"CVE-2025-61765","ts":1788883009490,"field":"exploit_available","old":"false","new":"true"},{"seq":1606,"id":"CVE-2025-61765","ts":1788882409786,"field":"exploit_available","old":"true","new":"false"},{"seq":717,"id":"CVE-2025-61765","ts":1788881846772,"field":"exploit_available","old":"false","new":"true"}]}