Denial of Service Vulnerability in Socket.IO Cluster Engine
CVE-2026-102600

7.5HIGH

Key Information:

Vendor

Socketio

Status
Socket.io
Cluster-engine
Vendor
CVE Published:
29 September 2026

What is CVE-2026-102600?

The @socket.io/cluster-engine prior to version 0.1.1 is vulnerable to a denial of service due to the improper handling of attacker-controlled session IDs in clustered Node.js deployments. Specifically, it retains inherited object properties, allowing special property names such as proto or constructor to traverse the prototype chain. This misconfiguration can lead to crashes in the Node.js process, impacting application availability. For maximum security, it is crucial to upgrade to the fixed version 0.1.1.

Affected Version(s)

cluster-engine < 0.1.1

socket.io < 0.1.1

References

https://github.com/socketio/socket.io/security/advisories...
x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/830e3642ebb8...
x_refsource_MISC
https://github.com/socketio/socket.io/releases/tag/@socke...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.