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NVD Vulnerability Details :
CVE-2026-33151
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-20 Mar, 2026 | 21:17
Updated At-14 Apr, 2026 | 18:22

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
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
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
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
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CPE Matches
socket
socket
>>socket.io-parser>>Versions before 3.3.5(exclusive)
cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*
socket
socket
>>socket.io-parser>>Versions from 3.4.0(inclusive) to 3.4.4(exclusive)
cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*
socket
socket
>>socket.io-parser>>Versions from 4.0.0(inclusive) to 4.2.6(exclusive)
cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*
Weaknesses
CWE IDTypeSource
CWE-20Primarysecurity-advisories@github.com
CWE-754Primarysecurity-advisories@github.com
NVD-CWE-noinfoPrimarynvd@nist.gov
CWE ID: CWE-20
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-754
Type: Primary
Source: security-advisories@github.com
CWE ID: NVD-CWE-noinfo
Type: Primary
Source: nvd@nist.gov
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4security-advisories@github.com
Patch
https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faafsecurity-advisories@github.com
Patch
https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78security-advisories@github.com
Patch
https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9security-advisories@github.com
Patch
Vendor Advisory
Hyperlink: https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9
Source: security-advisories@github.com
Resource:
Patch
Vendor Advisory
Change History
0Changes found
Details not found