CVE-2026-59724 – Socket.IO: Engine.IO WebTransport SID DoS

CVE ID :CVE-2026-59724

Published : July 8, 2026, 3:35 p.m. | 13 minutes ago

Description :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.

Severity: 0.0 | NA

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