socket.io allows an unbounded number of binary attachments

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-33151
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 21:17:15 UTC
Updated2026-04-14 18:22:20 UTC
DescriptionSocket.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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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

Problem Types: CWE-20 | CWE-754 | NVD-CWE-noinfo | CWE-20 CWE-20: Improper Input Validation | CWE-754 CWE-754: Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS: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/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Socket Socket.io-parser All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Socketio Socket.io affected < 3.3.5 Not specified
CNA Socketio Socket.io affected >= 3.4.0, < 3.4.4 Not specified
CNA Socketio Socket.io affected >= 4.0.0, < 4.2.6 Not specified

References

ReferenceSourceLinkTags
github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0d... [email protected] github.com Patch
github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc04... [email protected] github.com Patch
github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1a... [email protected] github.com Patch
github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9 [email protected] github.com Patch, Vendor Advisory
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