VDB
CVE-2026-59724
CVE-2026-59724
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published July 8, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| socketio | socket.io | >= 6.5.0, < 6.6.7 |
| socketio | socket.io | >= 6.5.0, < 6.6.7 |
Timeline
- Jul 8, 2026 CVE Published
- Jul 8, 2026 CVE Updated
- Jul 9, 2026 EPSS Score
- Jul 9, 2026 Coalition ESS Score
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score