CVE-2026-102599

Published: Ott 13, 2026 Last Modified: Ott 13, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

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.

248

Uncaught Exception

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Confidentiality
Potential Impacts:
Dos: Crash, Exit, Or Restart Read Application Data
Applicable Platforms
Languages: C++, Java, C#
View CWE Details
https://github.com/socketio/socket.io/commit/86db1fc3db2cd3…
https://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf…
https://github.com/socketio/socket.io/releases/tag/engine.i…
https://github.com/socketio/socket.io/releases/tag/[email protected]
https://github.com/socketio/socket.io/security/advisories/G…
https://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv