CVE-2026-59725

Published: Jul 8, 2026Modified: Jul 13, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Socket: Engine.io

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Socket Engine.io	From 4.1.0 to 6.6.7

Related CWEs

Improper Resource Shutdown or Release

The product does not release or incorrectly releases a resource before it is made available for re-use.

References (3)

https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671

Source: security-advisories@github.com

Patch

https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7

Source: security-advisories@github.com

Release Notes

https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x

Source: security-advisories@github.com

PatchVendor Advisory

Timeline

No history available yet.