{"cve":"CVE-2026-48804","nvd":{"published":"2026-08-11T20:17:42.580","modified":"2026-09-10T20:30:11.423","status":"Awaiting Analysis","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e","https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-48804","score":0.00488,"percentile":0.42023,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-5w7q-77mv-v69f","url":"https://osv.dev/vulnerability/GHSA-5w7q-77mv-v69f","summary":"python-socketio: Binary attachment accumulation can cause denial of service","modified":"2026-07-13T16:43:50.745760053Z","packages":[{"ecosystem":"PyPI","name":"python-socketio","purl":"pkg:pypi/python-socketio","ranges":["<5.16.2"],"fixed":["5.16.2"]}]},{"id":"PYSEC-2026-3042","url":"https://osv.dev/vulnerability/PYSEC-2026-3042","summary":"python-socketio: Binary attachment accumulation can cause denial of service","modified":"2026-07-13T16:33:29.305219409Z","packages":[{"ecosystem":"PyPI","name":"python-socketio","purl":"pkg:pypi/python-socketio","ranges":["<5.16.2"],"fixed":["5.16.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}