CVE-2026-48804

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{"bugzilla": {"description": "socketio: python-socketio: Denial of Service via binary attachment accumulation", "id": "2514329", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514329"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "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.", "A flaw was found in python-socketio, a Python implementation of the Socket.IO realtime client and server. The server stores binary messages in memory while awaiting their attachments. A remote attacker can exploit this by sending a binary message and deliberately withholding some attachments. This causes the incomplete messages to persist in memory, leading to excessive memory consumption and ultimately a Denial of Service (DoS) for the server."], "mitigation": {"lang": "en:us", "value": "Require authentication for all client connections before accepting socket requests, or enforce connection timeouts at the reverse proxy layer to disconnect incomplete binary payload streams."}, "name": "CVE-2026-48804", "public_date": "2026-08-11T19:17:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-48804\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-48804\nhttps://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e\nhttps://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f"], "statement": "A denial of service flaw exists in python-socketio's binary packet assembly mechanism. When handling incoming binary EVENT and ACK payloads, the server retains incomplete messages and partial attachments in memory while awaiting remaining attachments. An unauthenticated remote attacker can submit binary headers while deliberately withholding attachment streams, causing untracked memory accumulation until memory exhaustion occurs. When python-socketio processes unauthenticated websocket connections, malformed payload streams can degrade or crash the service, posing an Important impact to availability.", "threat_severity": "Important"}

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