What is CVE-2026-59724?

CVE-2026-59724 is a high-severity vulnerability in Socketio Socket.io, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-59724?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Socketio Socket.io

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 enabled can resolve a crafted session ID such as __proto__ through an inherited property of the…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Socketio Socket.io — versions >= 6.5.0, < 6.6.7

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-59724?: CVE-2026-59724 is a high-severity vulnerability in Socketio Socket.io, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-59724?: High severity. CVSS v3 base score is 7.5 out of 10.