CVE-2026-59725
High · 7.5CVSS
7.5
EPSS
0.6%
Published
Jul 8, 2026
CISA due date
—
The record
Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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