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HIGHCVE-2026-33151Published Modified CNA GitHub_M

CVE-2026-33151: socket.io allows an unbounded number of binary attachments

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, 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 issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.

Metrics

CVSS v4.0
8.7
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • socketio / socket.io
    < 3.3.5 · >= 3.4.0, < 3.4.4 · >= 4.0.0, < 4.2.6
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References