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

CVSS 7.5 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProductVersion RangeStatus
socketiosocket.io>= 6.5.0, < 6.6.7affected
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I. Basic Information for CVE-2026-59724

Vulnerability Information
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Vulnerability Title
Socket.IO: Engine.IO WebTransport SID DoS
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
socketiosocket.io >= 6.5.0, < 6.6.7 -

II. Public POCs for CVE-2026-59724

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 8850 chars
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III. Intelligence Information for CVE-2026-59724

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Patches & Fixes for CVE-2026-59724 (1)

Vendor Advisories for CVE-2026-59724 (1)

Vendor Pages for CVE-2026-59724 (1)

IV. Related Vulnerabilities

Same product: socket.io
Same vendor: socketio
Same weakness: CWE-20

V. Comments for CVE-2026-59724

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