CVE-2026-59724
HIGH
7.5
CVSS 3.1
Description
Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. 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 | — | >= 6.5.0, < 6.6.7 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-20 | cna | CWE-20: Improper Input Validation |
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-gr94-w7qr-f4j3 https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3
- https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c
- 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