CVE-2026-102599— Socket.IO: Engine.IO Protocol Revision Mismatch DoS
Quick assessment
Affected
socketio socket.io
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Socket.IO 为所有平台提供双向、低延迟的通信能力。在 Engine.IO 6.6.0 至 6.6.10 版本中，传输层升级过程可能仅根据升级请求独立推导出一个 Engine.IO 协议修订版，而未强制使用当前会话中已存储的修订版。恶意客户端可以建立一个有效会话，并发送一个包含不同或未指定 EIO 查询参数的升级请求，从而附加一个具有不兼容解析器和心跳行为的传输层。随后，精心构造的心跳包可触发未捕获异常，导致 Node.js 进程终止。即使已禁用与 Engine.IO v3 的兼容模式，该问题依然存在，因为在
Possible ATT&CK Techniques 1 AI
T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-102599
Vulnerability Information
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Vulnerability Title
Socket.IO: Engine.IO Protocol Revision Mismatch DoS
Source: CVE Program / CVE List V5
Vulnerability Description
Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing the revision stored on the existing session. A malicious client can establish a valid session and send an upgrade request with a different or omitted EIO query parameter, attaching a transport with incompatible parser and heartbeat behavior. A crafted heartbeat packet can then trigger an uncaught exception and terminate the Node.js process, including when Engine.IO v3 compatibility is disabled because an omitted EIO value is interpreted as revision 3 on the affected path. This issue is fixed in Engine.IO 6.6.10.
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
未捕获的异常
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-102599
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-102599 (1)
Vendor Advisories for CVE-2026-102599 (1)
Vendor Pages for CVE-2026-102599 (1)
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🔗 Release engine.io@6.6.10 · socketio/socket.io · GitHub x_refsource_MISC
IV. Related Vulnerabilities
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CVE-2026-102600
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V. Comments for CVE-2026-102599
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