CVE-2026-59724— Socket.IO: Engine.IO WebTransport SID DoS
Possible ATT&CK Techniques 1AI
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Socket Engine.IO 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Socket Engine.IO是Socket公司开源的一个跨浏览器双向通信层实现。 Socket Engine.IO存在输入验证错误漏洞，该漏洞源于输入验证错误，在启用WebTransport时，可通过解析特制session ID导致TypeError和拒绝服务。以下版本受到影响：6.5.0版本至6.6.7之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-59724
| # | POC Description | Source Link | Shenlong 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)
- 🔗 Release engine.io@6.6.7 · socketio/socket.io · GitHubx_refsource_MISC
IV. Related Vulnerabilities
Same product: socket.io
Same vendor: socketio
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Unhandled 'error' event in socket.io - CVE-2023-32695
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Same weakness: CWE-20
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