{"id":"DEBIAN-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":"2026-09-11T08:47:38.756485124Z","published":"2026-08-11T20:17:42.580Z","upstream":["CVE-2026-48804"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-48804"}],"affected":[{"package":{"name":"python-engineio","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-engineio?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-0.1","4.11.2-1","4.12.1-1","4.12.1-2","4.13.0-1","4.13.0-2","4.3.4-2","4.3.4-2.1","4.9.0-1","4.9.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48804.json"}},{"package":{"name":"python-engineio","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-engineio?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.2-1","4.12.1-1","4.12.1-2","4.13.0-1","4.13.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48804.json"}},{"package":{"name":"python-engineio","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-engineio?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.2-1","4.12.1-1","4.12.1-2","4.13.0-1","4.13.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-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"}]}