CVE-2024-38355

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. This issue is fixed by commit `15af22fc22` which has been included in `socket.io@4.6.2` (released in May 2023). The fix was backported in the 2.x branch as well with commit `d30630ba10`. Users are advised to upgrade. Users unable to upgrade may attach a listener for the "error" event to catch these errors.

• CWE-20
• CWE-754

• https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115
• https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c
• https://github.com/socketio/socket.io/security/advisories/GHSA-25hc-qcg6-38wj
• https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115
• https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c
• https://github.com/socketio/socket.io/security/advisories/GHSA-25hc-qcg6-38wj
• https://www.vicarius.io/vsociety/posts/unhandled-exception-in-socketio-cve-2024-38355

Published

Jun 19, 2024

Last Modified

Jun 17, 2026

Status

Deferred

• 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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