Vulnerability in Socketio Socket.io
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 does not properly close the HTTP response for invalid binary POST requests with Content-Type…
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 >= 4.1.0, < 6.6.7
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)
Frequently asked questions
- What is CVE-2026-59725?
- CVE-2026-59725 is a high-severity vulnerability in Socketio Socket.io, classified under Improper Resource Shutdown or Release. CVSS score: 7.5/10. Published 2026-07-08.
- How severe is CVE-2026-59725?
- High severity. CVSS v3 base score is 7.5 out of 10.