{"id":"CVE-2026-48804","title":"python-socketio is a Python implementation of the Socket.IO realtime client and server","summary":"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 attach…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"python-socketio","product":"python-socketio","affected":["python-socketio <= 5.16.1"],"patched":["python-socketio 5.16.2"],"published":"2026-08-11","updated":"2026-09-10","sourceUpdated":"2026-09-10T20:30:11.423","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48804","references":[{"url":"https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e","label":"security-advisories@github.com"},{"url":"https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-5w7q-77mv-v69f"}],"tags":["nvd","ghsa","pip"],"epss":0.00279,"epssPercentile":0.20614,"ecosystem":"pip","ingestedAt":"2026-06-29T13:24:35.263Z","slug":"CVE-2026-48804","body":"## Overview\n\npython-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-48804)\n\nAffected packages:\n\n- `python-socketio <= 5.16.1`\n\nPatched in:\n\n- `python-socketio 5.16.2`\n\nSource: https://github.com/advisories/GHSA-5w7q-77mv-v69f","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}