Vulnerability index

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Engine.io HIGH 7.5
CVE-2026-59725

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport do…

Fix: 6.6.7+
Fix from $1,950 2026-07-08
Engine.io HIGH 7.5
CVE-2026-59724

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enable…

Fix: 6.6.7+
Fix from $1,950 2026-07-08
Socket.io Parser HIGH 7.5
CVE-2026-33151

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially c…

Fix: 3.3.5 / 3.4.4+
Fix from $1,950 2026-03-20
Socket.io Parser HIGH 7.5
CVE-2023-32695

socket.io parser is a socket.io encoder and decoder written in JavaScript complying with version 5 of socket.io-protocol. A specially crafted Socket.…

Fix: 3.4.3 / 4.2.3+
Fix from $1,950 2023-05-27
Engine.io MEDIUM 6.5
CVE-2023-31125

Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. An uncaught exception…

Fix: 6.4.2+
Fix from $1,600 2023-05-08
Engine.io MEDIUM 6.5
CVE-2022-41940

Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted H…

Fix: 3.6.1 / 6.2.1+
Fix from $1,600 2022-11-22
Socket.io Parser CRITICAL 9.8
CVE-2022-2421

Due to improper type validation in attachment parsing the Socket.io js library, it is possible to overwrite the _placeholder object which allows an a…

Fix: 3.3.3 / 3.4.2+
Fix from $2,300 2022-10-26
Socket.io Client Java HIGH 7.5
CVE-2022-25867

The package io.socket:socket.io-client before 2.0.1 are vulnerable to NULL Pointer Dereference when parsing a packet with with invalid payload format.

Fix: 2.0.1+
Fix from $1,950 2022-08-02
Engine.io HIGH 7.5
CVE-2022-21676

Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted H…

Fix: 4.1.2 / 5.2.1+
Fix from $1,950 2022-01-12
Engine.io HIGH 7.5
CVE-2020-36048

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.

Fix: 4.0.0+
Fix from $1,950 2021-01-08
Socket.io Parser HIGH 7.5
CVE-2020-36049

socket.io-parser before 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach …

Fix: 3.4.1+
Fix from $1,950 2021-01-08
Socket.io HIGH 7.5
CVE-2017-16031

Socket.io is a realtime application framework that provides communication via websockets. Because socket.io 0.9.6 and earlier depends on `Math.random…

Fix: after 0.9.6
Fix from $1,950 2018-06-04
Engine.io Client MEDIUM 5.9
CVE-2016-10536

engine.io-client is the client for engine.io, the implementation of a transport-based cross-browser/cross-device bi-directional communication layer f…

Fix: after 1.6.8
Fix from $1,600 2018-05-31