CVEvulnerability

CVE-2026-59724

7.5 HIGH Published 2026-07-08 Modified 2026-10-25 Official page ↗

Status: Analyzed
Published: 2026-07-08
Last modified: 2026-10-25
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses: CWE-20

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.

Affected configurations

• socket engine.io (>= 6.5.0 < 6.6.7)

Weakness · CWE (1)

CWE-20 Improper Input Validation weakness

References

https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c Patch
https://github.com/socketio/socket.io/releases/tag/[email protected] Release Notes
https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3 Patch, Vendor Advisory, Mitigation

CVE-2026-59724

Description

Affected configurations

Related

Weakness · CWE (1)

References