{"id":"UBUNTU-CVE-2025-61765","details":"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.","modified":"2026-05-20T16:23:39.503560744Z","published":"2025-10-06T16:15:00Z","upstream":["CVE-2025-61765"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-61765"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-61765"},{"type":"REPORT","url":"https://github.com/miguelgrinberg/python-socketio/commit/53f6be094257ed81476b0e212c8cddd6d06ca39a"},{"type":"REPORT","url":"https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-g8c6-8fjj-2r4m"}],"affected":[{"package":{"name":"python-socketio","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-socketio?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1","4.4.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"4.4.0-2","binary_name":"python3-socketio"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61765.json"}},{"package":{"name":"python-socketio","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-socketio?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.3-2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-socketio","binary_version":"5.0.3-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61765.json"}},{"package":{"name":"python-socketio","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-socketio?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-socketio","binary_version":"5.7.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61765.json"}},{"package":{"name":"python-socketio","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/python-socketio?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.12.1-1","5.13.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-socketio","binary_version":"5.13.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61765.json"}},{"package":{"name":"python-socketio","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-socketio?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.13.0-1","5.16.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-socketio","binary_version":"5.16.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61765.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]}