socketio/socket.io · Security
Socket.IO: Zero-attachment Memory Exhaustion
- GHSA ID
- GHSA-2m8v-j782-fhvr
- CVE ID
- CVE-2026-69185
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Impact
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.
Patches
| Version range | Used by | Fixed version |
|---|---|---|
>=4.0.0 <4.2.7 |
[email protected] and [email protected] |
4.2.7 |
>=3.4.0 <3.4.5 |
[email protected] |
3.4.5 |
<3.3.6 |
[email protected] |
3.3.6 |
Workarounds
There is no known workaround except upgrading to a safe version.
For more information
If you have any questions or comments about this advisory:
- Open a discussion here
CWEs
- CWE-20 · Improper Input Validation
- CWE-754 · Improper Check for Unusual or Exceptional Conditions
References
- https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr ↗
- https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4 ↗
- https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240 ↗
- https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291 ↗
- https://github.com/advisories/GHSA-2m8v-j782-fhvr ↗