CVE-2026-69185
Socket.IO: Zero-attachment Memory Exhaustion
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.
| CWE | CWE-20 CWE-754 |
| Vendor | socketio |
| Product | socket.io |
| Published | Aug 3, 2026 |
| Last Updated | Aug 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
socketio / socket.io
< 3.3.6 >= 3.4.0, < 3.4.5 >= 4.0.0, < 4.2.7
References
github.com: https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr github.com: https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4 github.com: https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240 github.com: https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291