{"id":"CVE-2026-48804","aliases":["DEBIAN-CVE-2026-48804","EUVD-2026-56894","GHSA-5w7q-77mv-v69f","PYSEC-2026-3042","ROOT-APP-PYPI-CVE-2026-48804","SUSE-SU-2026:3086-1","UBUNTU-CVE-2026-48804","openSUSE-SU-2026:11171-1"],"status":"published","title":"python-socketio: Binary attachment accumulation can cause denial of service","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00488,"percentile":0.42281,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2026-06-26T20:51:58Z","modified":"2026-10-28T02:30:59Z","fixes":[{"ecosystem":"PyPI","package":"python-socketio","fixed_in":["5.16.2"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"python-socketio","fixed_in":["5.17.0-1"],"sources":["osv"]},{"ecosystem":"Root:PyPI","package":"rootio-python-socketio","fixed_in":["5.16.1+root.io.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","package":"python-python-socketio","fixed_in":["5.7.2-150600.3.6.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"python-python-socketio","fixed_in":["5.7.2-150600.3.6.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","package":"python-python-socketio","fixed_in":["5.7.2-150600.3.6.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-python-socketio","fixed_in":["5.16.3-1.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.16.1"},{"fixed":"5.16.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.11.2-1","5.11.2-1.1","5.12.1-1","5.13.0-1","5.16.0-1","5.17.0-1","5.7.2-2"]},{"source":"osv","ecosystem":"Debian:13","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.12.1-1","5.13.0-1","5.16.0-1","5.17.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.0-1"}]}],"versions":["5.12.1-1","5.13.0-1","5.16.0-1"]},{"source":"osv","ecosystem":"PyPI","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.2"}]}],"versions":["0.1.0","0.2.0","0.3.0","0.4.0","0.4.1","0.4.2","0.5.0","0.5.1","0.5.2","0.6.0","0.6.1","0.7.0","0.8.0","0.8.1","0.8.2","0.9.0","0.9.1","0.9.2","1.0","1.1","1.2","1.3","1.4","1.4.1","1.4.2","1.4.3","1.4.4","1.5.0","1.5.1","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.9.0","2.0.0","2.1.0","2.1.1","2.1.2","3.0.0","3.0.1","3.1.0","3.1.1","3.1.2","4.0.0","4.0.1","4.0.2","4.0.3","4.1.0","4.2.0","4.2.1","4.3.0","4.3.1","4.4.0","4.5.0","4.5.1","4.6.0","4.6.1","5.0.0","5.0.1","5.0.2","5.0.3","5.0.4","5.1.0","5.10.0","5.11.0","5.11.1","5.11.2","5.11.3","5.11.4","5.12.0","5.12.1","5.13.0","5.14.0","5.14.1","5.14.2","5.14.3","5.15.0","5.15.1","5.16.0","5.16.1","5.2.0","5.2.1","5.3.0","5.4.0","5.4.1","5.5.0","5.5.1","5.5.2","5.6.0","5.7.0","5.7.1","5.7.2","5.8.0","5.9.0"]},{"source":"osv","ecosystem":"PyPI","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.2"}]}],"versions":["0.1.0","0.2.0","0.3.0","0.4.0","0.4.1","0.4.2","0.5.0","0.5.1","0.5.2","0.6.0","0.6.1","0.7.0","0.8.0","0.8.1","0.8.2","0.9.0","0.9.1","0.9.2","1.0","1.1","1.2","1.3","1.4","1.4.1","1.4.2","1.4.3","1.4.4","1.5.0","1.5.1","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.9.0","2.0.0","2.1.0","2.1.1","2.1.2","3.0.0","3.0.1","3.1.0","3.1.1","3.1.2","4.0.0","4.0.1","4.0.2","4.0.3","4.1.0","4.2.0","4.2.1","4.3.0","4.3.1","4.4.0","4.5.0","4.5.1","4.6.0","4.6.1","5.0.0","5.0.1","5.0.2","5.0.3","5.0.4","5.1.0","5.10.0","5.11.0","5.11.1","5.11.2","5.11.3","5.11.4","5.12.0","5.12.1","5.13.0","5.14.0","5.14.1","5.14.2","5.14.3","5.15.0","5.15.1","5.16.0","5.16.1","5.2.0","5.2.1","5.3.0","5.4.0","5.4.1","5.5.0","5.5.1","5.5.2","5.6.0","5.7.0","5.7.1","5.7.2","5.8.0","5.9.0"]},{"source":"osv","ecosystem":"Root:PyPI","package":"rootio-python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.1+root.io.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","package":"python-python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.2-150600.3.6.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"python-python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.2-150600.3.6.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","package":"python-python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.2-150600.3.6.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1","4.4.0-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.3-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.2-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.16.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.13.0-1","5.16.0-1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-python-socketio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.3-1.1"}]}]}],"products":[{"vendor":"miguelgrinberg","product":"python-socketio"}],"references":[{"url":"https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/miguelgrinberg/python-socketio/commit/4bec3ef87bcfd6ab5b94cd3ac09d873283a6960e","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/advisories/GHSA-5w7q-77mv-v69f","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48804.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48804","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-48804","tags":["advisory"]},{"url":"https://github.com/miguelgrinberg/python-socketio","tags":["package"]},{"url":"https://pypi.org/project/python-socketio","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263086-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1269491","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-48804","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-48804","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-48804","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-48804","title":"python-socketio: Binary attachment accumulation can cause denial of service","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.","status":"published","published":"2026-08-11T19:17:53.687Z","modified":"2026-08-13T14:39:14.373Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T13:50:49.872037Z"}],"euvd":[{"id":"EUVD-2026-56894","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.","status":"published","published":"2026-08-11T19:17:53Z","modified":"2026-08-13T14:39:14Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:01:56.415282Z"}],"ghsa":[{"id":"GHSA-5w7q-77mv-v69f","title":"python-socketio: Binary attachment accumulation can cause denial of service","description":"### Impact\nThe 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. 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.\n\n### Patches\nVersion 5.16.2 takes the following measures to address this issue:\n- Binary packets are only accepted from authenticated clients.\n- When a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.","status":"published","published":"2026-06-26T20:51:58Z","modified":"2026-06-26T20:51:58Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:40:33.778544Z"}],"nvd":[{"id":"CVE-2026-48804","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.","status":"published","published":"2026-08-11T20:17:42.58Z","modified":"2026-09-10T20:30:11.423Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:12:36.880938Z"}],"osv":[{"id":"CVE-2026-48804","title":"python-socketio: Binary attachment accumulation can cause denial of service","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.","status":"published","published":"2026-08-11T19:17:53.687Z","modified":"2026-10-28T02:30:59.730893305Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:45:06.701612Z"},{"id":"DEBIAN-CVE-2026-48804","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.","status":"published","published":"2026-08-11T20:17:42.58Z","modified":"2026-10-09T05:00:06.899687435Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:56.444225Z"},{"id":"GHSA-5w7q-77mv-v69f","title":"python-socketio: Binary attachment accumulation can cause denial of service","description":"### Impact\nThe 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. 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.\n\n### Patches\nVersion 5.16.2 takes the following measures to address this issue:\n- Binary packets are only accepted from authenticated clients.\n- When a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.","status":"published","published":"2026-06-26T20:51:58Z","modified":"2026-07-13T16:43:50.745760053Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:46:38.911014Z"},{"id":"PYSEC-2026-3042","title":"python-socketio: Binary attachment accumulation can cause denial of service","description":"### Impact\nThe 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. 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.\n\n### Patches\nVersion 5.16.2 takes the following measures to address this issue:\n- Binary packets are only accepted from authenticated clients.\n- When a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.","status":"published","published":"2026-07-13T15:46:24.787391Z","modified":"2026-07-13T16:33:29.305219409Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:56.429374Z"},{"id":"UBUNTU-CVE-2026-48804","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.","status":"published","published":"2026-08-11T20:17:00Z","modified":"2026-10-17T12:58:31.85246815Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:33.391918Z"},{"id":"openSUSE-SU-2026:11171-1","title":"python311-python-socketio-5.16.3-1.1 on GA media","description":"These are all security issues fixed in the python311-python-socketio-5.16.3-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-07-01T00:00:00Z","modified":"2026-07-02T18:24:17.909554907Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"ROOT-APP-PYPI-CVE-2026-48804","title":"CVE-2026-48804 in rootio-python-socketio - Patched by Root","description":"Root has patched CVE-2026-48804 in the rootio-python-socketio package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-07-07T08:36:27Z","modified":"2026-07-07T13:30:07.289670484Z","updated_at":"2026-11-02T15:53:28.259095Z"},{"id":"SUSE-SU-2026:3086-1","title":"Security update for python-python-socketio","description":"This update for python-python-socketio fixes the following issues:\n\n- CVE-2026-48804: Binary attachment accumulation can cause denial of service (bsc#1269491).\n","status":"published","published":"2026-07-16T17:53:06Z","modified":"2026-07-17T09:30:07.408777903Z","updated_at":"2026-11-02T15:54:04.987808Z"}]}}