Socket.Io · Socket.Io · CVE-2026-33151
**Name of the Vulnerable Software and Affected Versions**
Socket.IO versions prior to 3.3.5
Socket.IO versions 3.3.5 through 3.4.4
Socket.IO versions 4.0.0 through 4.2.6
**Description**
Socket.IO is a real-time, bidirectional, event-based communication framework. A specially crafted Socket.IO packet can cause the server to wait for and buffer a large number of binary attachments, potentially leading to server memory exhaustion.
**Recommendations**
Versions prior to 3.3.5: Upgrade to version 3.3.5 or later.
Versions 3.3.5 through 3.4.4: Upgrade to version 3.4.4 or later.
Versions 4.0.0 through 4.2.6: Upgrade to version 4.2.6 or later.