CVE-2026-69185: CWE-20: Improper Input Validation in socketio socket.io
Socket.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.
AI Analysis
Technical Summary
Socket.IO versions before 4.2.7, 3.4.5, and 3.3.6 contain an improper input validation vulnerability (CWE-20) where a specially crafted packet can cause the server to wait for and buffer an excessive number of binary attachments. This can exhaust server memory resources, leading to denial of service (availability impact). The vulnerability is tracked as CVE-2026-69185 and has a CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). The issue is fixed in versions 4.2.7, 3.4.5, and 3.3.6.
Potential Impact
The vulnerability can cause a denial of service by exhausting server memory due to buffering many binary attachments from a crafted packet. There is no impact on confidentiality or integrity, only availability is affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrading to socket.io versions 4.2.7, 3.4.5, or 3.3.6 or later fully mitigates this vulnerability. Patch status is confirmed by the version fixes stated in the advisory. No additional vendor advisory content is provided, so check official socket.io release notes for confirmation.
CVE-2026-69185: CWE-20: Improper Input Validation in socketio socket.io
Description
Socket.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.
CVSS v3.1
Score 7.5high
Affected software
pkg:npm/socket.io/socket.ioRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Socket.IO versions before 4.2.7, 3.4.5, and 3.3.6 contain an improper input validation vulnerability (CWE-20) where a specially crafted packet can cause the server to wait for and buffer an excessive number of binary attachments. This can exhaust server memory resources, leading to denial of service (availability impact). The vulnerability is tracked as CVE-2026-69185 and has a CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). The issue is fixed in versions 4.2.7, 3.4.5, and 3.3.6.
Potential Impact
The vulnerability can cause a denial of service by exhausting server memory due to buffering many binary attachments from a crafted packet. There is no impact on confidentiality or integrity, only availability is affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrading to socket.io versions 4.2.7, 3.4.5, or 3.3.6 or later fully mitigates this vulnerability. Patch status is confirmed by the version fixes stated in the advisory. No additional vendor advisory content is provided, so check official socket.io release notes for confirmation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-03T16:00:23.482Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a70f0bfbf32cb7a341a779c
Added to database: 08/03/2026, 19:49:19 UTC
Last enriched: 08/03/2026, 20:02:54 UTC
Last updated: 08/03/2026, 20:49:14 UTC
Views: 4
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