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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-33151

socket.io allows an unbounded number of binary attachments

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

socketio socket.io

  • < 3.3.5affected
  • >= 3.4.0, < 3.4.4affected
  • >= 4.0.0, < 4.2.6affected

References