GHSA-677m-j7p3-52f9
socket.io allows an unbounded number of binary attachments
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | socket.io-parser | < 3.3.5 | 3.3.5 |
| npm | socket.io-parser | >= 3.4.0, < 3.4.4 | 3.4.4 |
| npm | socket.io-parser | >= 4.0.0, < 4.2.6 | 4.2.6 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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](https://github.com/socketio/socket.io/discussions)
References
External links from the advisory. They lead to third-party sites.
- https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9
- https://nvd.nist.gov/vuln/detail/CVE-2026-33151
- 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://github.com/socketio/socket.io