Socket.IO: Zero-attachment Memory Exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-69185
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-03 20:17:29 UTC
Updated2026-08-03 21:16:41 UTC
DescriptionSocket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, 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 vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Socketio Socket.io affected < 3.3.6 Not specified
CNA Socketio Socket.io affected >= 3.4.0, < 3.4.5 Not specified
CNA Socketio Socket.io affected >= 4.0.0, < 4.2.7 Not specified

References

ReferenceSourceLinkTags
github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a... [email protected] github.com
github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr [email protected] github.com
github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b... [email protected] github.com
github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb1... [email protected] github.com
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