{"id":"CVE-2026-48804","summary":"python-socketio: Binary attachment accumulation can cause denial of service","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.","aliases":["GHSA-5w7q-77mv-v69f","PYSEC-2026-3042"],"modified":"2026-09-12T03:30:42.737382570Z","published":"2026-08-11T19:17:53.687Z","related":["SUSE-SU-2026:3086-1","openSUSE-SU-2026:11171-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48804.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-770"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48804.json"},{"type":"ADVISORY","url":"https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48804"},{"type":"FIX","url":"https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/miguelgrinberg/python-socketio","events":[{"introduced":"0"},{"fixed":"4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"5.16.4"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v5.16.3","v5.16.2","v5.16.1","v5.16.0","v5.15.1","v5.15.0","v5.14.3","v5.14.2","v5.14.1","v5.14.0","v5.13.0","v5.12.1","v5.12.0","v5.11.4","v5.11.3","v5.11.2","v5.11.1","v5.11.0","v5.10.0","v4.6.1","v5.9.0","v5.8.0","v5.7.2","v5.7.1","v5.7.0","v5.6.0","v5.5.2","v5.5.1","v5.5.0","v5.4.1","v5.4.0","v5.3.0","v5.2.1","v5.2.0","v5.1.0","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v5.0.0","v4.6.0","v4.5.1","v4.5.0","v4.4.0","v4.3.1","v4.3.0","v4.2.1","v4.2.0","v4.1.0","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.1.1","v3.1.0","v3.0.1","v3.0.0","v2.1.2","v2.1.1","v.2.1.1","v2.1.0","v2.0.0","v1.9.0","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4","v1.3","v1.2","v1.1","v1.0","v0.9.1","v0.9.0","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.1","v0.5.2","v0.5.0","v0.4.1","v0.4.0","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}