CVE-2026-33151

HIGH8.7

socket.io allows an unbounded number of binary attachments

Published Mar 20, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4

WEB

https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf

WEB

https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78

WEB

https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-33151

CVSS Analysis