CVE-2026-59725
HIGH
7.5
CVSS 3.1
Description
Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.
Metadata
Severity & Metrics
7.5
HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| socketio | socket.io | — | >= 4.1.0, < 6.6.7 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-404 | cna | CWE-404: Improper Resource Shutdown or Release |
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 7.5 | HIGH | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (3)
- https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x
- https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671 https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671
- https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7 https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7