CVE-2026-102600
CVE-2026-102600 · Socket.IO: Prototype Pollution via Unsafe Client Session Lookup
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 0.1.1, @socket.io/cluster-engine uses inherited object properties when looking up attacker-controlled session IDs in clustered deployments. Special property names such as __proto__ or constructor can resolve through the object prototype chain instead of identifying an actual connected client, causing the Node.js process to crash and resulting in denial of service. Applications that do not use @socket.io/cluster-engine are not affected. This issue is fixed in version 0.1.1.
CVSS 7.5 · High · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
socket.io
- Versions
- < 0.1.1: Affected
No fix published
cluster-engine
- Versions
- < 0.1.1: Affected
No fix published
@socket.io/cluster-engine npm
- Affected ranges
- SEMVER: < 0.1.1
Update to 0.1.1