{"id":"UBUNTU-CVE-2026-48804","details":"python-socketio is a Python implementation of the Socket.IO realtime client and server. The python-socketio server stores binary `EVENT` and `ACK` messages in memory while it waits to receive their binary attachments. Once all the attachments are received, these messages are then processed. Prior to version 5.16.4, an attacker can submit a binary message and intentionally omit sending one or more of its attachments to cause the message along with the partial list of received attachments to stay in memory for a long time. Version 5.16.4 takes the following measures to address this issue: Binary packets are only accepted from authenticated clients and, when a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.","modified":"2026-08-19T11:05:28Z","published":"2026-08-11T20:17:00Z","upstream":["CVE-2026-48804"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48804"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-48804"},{"type":"REPORT","url":"https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e"},{"type":"REPORT","url":"https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f"}],"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_name":"python3-socketio","binary_version":"4.4.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48804.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/2026/UBUNTU-CVE-2026-48804.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/2026/UBUNTU-CVE-2026-48804.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/2026/UBUNTU-CVE-2026-48804.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}