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VULNERABILITIES

CVE-2026-59724 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c [email protected]Patch
https://github.com/socketio/socket.io/releases/tag/[email protected] [email protected]Release Notes
https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3 [email protected]PatchVendor AdvisoryMitigation

Weakness Enumeration

CWE-IDCWE NameSource
NVD-CWE-noinfoInsufficient Information to Classify Weakness[email protected]
CWE-20Improper Input Validation[email protected]

Affected Products

ProductVersions
socket engine.io
>= 6.5.0, < 6.6.7

CPE

  • cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-59724
NVD Published Date:
Jul 8, 2026
NVD Last Modified:
Jul 13, 2026
Source:
[email protected]
CVE-2026-59724 Details - Not Deferred