EUVD-2026-56894
GHSA-5w7q-77mv-v69f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Remotely reachable binary path with no auth in vulnerable versions (AV:N/AC:L/PR:N/UI:N), availability-only memory exhaustion (A:H), no confidentiality or integrity impact and no scope change.
Primary rating from Vendor (https://github.com/miguelgrinberg/python-socketio).
CVSS VectorVendor: https://github.com/miguelgrinberg/python-socketio
Lifecycle Timeline
2Blast Radius
ecosystem impact- 17 pypi packages depend on python-socketio (5 direct, 12 indirect)
Ecosystem-wide dependent count for version 5.16.2.
DescriptionCVE.org
Impact
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. 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.
Patches
Version 5.16.2 takes the following measures to address this issue:
- Binary packets are only accepted from authenticated clients.
- When a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.
Articles & Coverage 1
AnalysisAI
Memory-exhaustion denial of service in the python-socketio server (Socket.IO for Python, versions <= 5.16.1) lets remote clients pin server memory by sending binary EVENT or ACK packets while deliberately withholding one or more of the declared binary attachments. Because the server buffers the partial message and its received attachments in memory until all attachments arrive, an attacker can repeatedly open such incomplete messages to grow memory consumption unbounded and exhaust server resources. No public exploit identified at time of analysis; not listed in CISA KEV.
Technical ContextAI
Socket.IO is an event-driven, bidirectional client/server messaging protocol layered over Engine.IO/WebSocket transports; python-socketio is the canonical Python server/client implementation distributed on PyPI as python-socketio. The protocol allows binary payloads to be split across a leading packet that declares how many binary attachments will follow, plus the attachment frames themselves. The vulnerability is a textbook CWE-770 (Allocation of Resources Without Limits or Throttling): the server commits memory to hold the pending EVENT/ACK packet and its accumulating attachment buffers, but applies no cap, timeout, or per-client cleanup on messages whose attachment set never completes, so resources stay allocated indefinitely.
RemediationAI
Upgrade to python-socketio 5.16.2 (Vendor-released patch: 5.16.2), which only accepts binary packets from authenticated clients and deletes any partially received binary message held for a client when that client disconnects; install via pip install --upgrade python-socketio and pin >=5.16.2 in dependency manifests. Where immediate upgrade is not possible, the most effective compensating control is to require authentication before accepting connections or to reject/limit binary EVENT/ACK payloads at the application layer, since the fix itself keys on authentication - trade-off: this breaks legitimate anonymous binary messaging if your app relies on it. Additionally, place the server behind a reverse proxy or WAF that enforces per-connection message-size and rate limits and aggressive idle/connection timeouts to cap how long incomplete messages and their buffers can persist, and monitor process memory to recycle workers under pressure; the trade-off is that overly tight timeouts may drop slow but legitimate clients. See the advisory at https://github.com/miguelgrinberg/python-socketio/security/advisories/GHSA-5w7q-77mv-v69f for details.
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View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Fixed |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Fixed |
| openSUSE Tumbleweed | Fixed |
| SUSE Linux Enterprise Desktop 15 SP7 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
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