CVE-2026-33151
HIGH EPSS 39.8%
Published Mar 20, 20263mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
Published Mar 20, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
39.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 2
CWE-20 Improper Input Validation Validation
CWE-754
Affected Products 3
References 4
- github.com https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4
- github.com https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf
- github.com https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78
- github.com https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9
Remediation
- github.com https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4
- github.com https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf
- github.com https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78
- github.com https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9