CVE-2016-10536

engine.io-client is the client for engine.io, the implementation of a transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. The vulnerability is related to the way that node.js handles the `rejectUnauthorized` setting. If the value is something that evaluates to false, certificate verification will be disabled. This is problematic as engine.io-client 1.6.8 and earlier passes in an object for settings that includes the rejectUnauthorized property, whether it has been set or not. If the value has not been explicitly changed, it will be passed in as `null`, resulting in certificate verification being turned off.

• CWE-300
• CWE-295

• https://github.com/socketio/engine.io-client/commit/2c55b278a491bf45313ecc0825cf800e2f7ff5c1Patch, Third Party Advisory
• https://nodesecurity.io/advisories/99Third Party Advisory
• https://www.cigital.com/blog/node-js-socket-io/Third Party Advisory
• https://github.com/socketio/engine.io-client/commit/2c55b278a491bf45313ecc0825cf800e2f7ff5c1Patch, Third Party Advisory
• https://nodesecurity.io/advisories/99Third Party Advisory
• https://www.cigital.com/blog/node-js-socket-io/Third Party Advisory

Published

May 31, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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