Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3
- https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-
FAQ
What is CVE-2026-48804?
CVE-2026-48804 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 bi...
How severe is CVE-2026-48804?
CVE-2026-48804 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48804?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.