socketio/socket.io · Security
socket.io allows an unbounded number of binary attachments
- GHSA ID
- GHSA-677m-j7p3-52f9
- CVE ID
- CVE-2026-33151
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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 <4.2.6 |
[email protected] and [email protected] |
4.2.6 |
>=3.4.0 <3.4.4 |
[email protected] |
3.4.4 |
<3.3.5 |
[email protected] |
3.3.5 |
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-754 · Improper Check for Unusual or Exceptional Conditions
References
- https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9 ↗
- https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4 ↗
- https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf ↗
- https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-33151 ↗
- https://github.com/advisories/GHSA-677m-j7p3-52f9 ↗