python-socketio — security advisory

{
  "id": "2f5a24964a1442e92269c4335fb80ebf42daedc8f0d1ca3fb9229662ce0b2adb",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-61765",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2025-61765",
    "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 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 ",
    "evidence": "osv:DEBIAN-CVE-2025-61765",
    "products": [
      {
        "name": {
          "value": "python-socketio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.11.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.11.2-1.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.12.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.13.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.16.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.17.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.7.2-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-socketio",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.12.1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "5.13.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "5.16.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "5.17.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-socketio",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.16.0-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "5.12.1-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "5.13.0-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2025-61765",
      "aliases": [
        "DEBIAN-CVE-2025-61765"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-socketio",
            "purl": "pkg:deb/debian/python-socketio?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "5.11.2-1",
            "5.11.2-1.1",
            "5.12.1-1",
            "5.13.0-1",
            "5.16.0-1",
            "5.17.0-1",
            "5.7.2-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61765.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-socketio",
            "purl": "pkg:deb/debian/python-socketio?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "5.12.1-1",
            "5.13.0-1",
            "5.16.0-1",
            "5.17.0-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61765.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5.16.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "python-socketio",
            "purl": "pkg:deb/debian/python-socketio?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "5.12.1-1",
            "5.13.0-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61765.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-10T10:00:08.372440639Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-61765"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2025-61765"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-61765",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 228583,
  "published_at": "2025-10-06T16:15:35.4+00:00"
}