Improper input validation in Socketio Socket.io
CVE-2026-69185
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.005 (41.9th percentile) — read the EPSS interpretation.
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 < 3.3.6, >= 3.4.0, < 3.4.5, >= 4.0.0, < 4.2.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-69185?
- CVE-2026-69185 is a high-severity vulnerability in Socketio Socket.io, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-08-03.
- How severe is CVE-2026-69185?
- High severity. CVSS v3 base score is 7.5 out of 10.