CVE-2026-59725
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Jul 08, 2026
Vendor
unknown
Description
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.