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CVE-2026-102599 (GCVE-0-2026-102599)

Vulnerability from nvd – Published: 2026-10-13 19:05 – Updated: 2026-10-17 00:39

Title

Socket.IO: Engine.IO Protocol Revision Mismatch DoS

Summary

Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing the revision stored on the existing session. A malicious client can establish a valid session and send an upgrade request with a different or omitted EIO query parameter, attaching a transport with incompatible parser and heartbeat behavior. A crafted heartbeat packet can then trigger an uncaught exception and terminate the Node.js process, including when Engine.IO v3 compatibility is disabled because an omitted EIO value is interpreted as revision 3 on the affected path. This issue is fixed in Engine.IO 6.6.10.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-17 00:39 UTC

CWE

CWE-248 - Uncaught Exception

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/86db…	x_refsource_MISC
https://github.com/socketio/socket.io/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
socketio	socket.io	Affected: >= 6.6.0, < 6.6.10

Show details on NVD website

JSON

To clipboard

{
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CVE-2026-102600 (GCVE-0-2026-102600)

Vulnerability from nvd – Published: 2026-09-29 15:23 – Updated: 2026-09-29 16:28

Title

Socket.IO: Prototype Pollution via Unsafe Client Session Lookup

Summary

Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 0.1.1, @socket.io/cluster-engine uses inherited object properties when looking up attacker-controlled session IDs in clustered deployments. Special property names such as __proto__ or constructor can resolve through the object prototype chain instead of identifying an actual connected client, causing the Node.js process to crash and resulting in denial of service. Applications that do not use @socket.io/cluster-engine are not affected. This issue is fixed in version 0.1.1.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 16:27 UTC

CWE

CWE-20 - Improper Input Validation
CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/830e…	x_refsource_MISC
https://github.com/socketio/socket.io/releases/ta…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
socketio	socket.io	Affected: < 0.1.1
@socket.io	cluster-engine	Affected: < 0.1.1

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-102600",
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CVE-2026-69185 (GCVE-0-2026-69185)

Vulnerability from nvd – Published: 2026-08-03 19:09 – Updated: 2026-08-03 20:31

Title

Socket.IO: Zero-attachment Memory Exhaustion

Summary

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.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 20:31 UTC

CWE

CWE-20 - Improper Input Validation
CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/7c6e…	x_refsource_MISC
https://github.com/socketio/socket.io/commit/9c63…	x_refsource_MISC
https://github.com/socketio/socket.io/commit/ced9…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
socketio	socket.io	Affected: < 3.3.6 Affected: >= 3.4.0, < 3.4.5 Affected: >= 4.0.0, < 4.2.7

Show details on NVD website

JSON

To clipboard

{
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CVE-2026-59725 (GCVE-0-2026-59725)

Vulnerability from nvd – Published: 2026-07-08 15:37 – Updated: 2026-10-14 18:46

Title

Socket.IO: Engine.IO Polling Transport Connection Exhaustion

Summary

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 16:50 UTC

CWE

CWE-404 - Improper Resource Shutdown or Release

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/fc11…	x_refsource_MISC
https://github.com/socketio/socket.io/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
socketio	engine.io	Affected: >= 4.1.0, < 6.6.7

Show details on NVD website

JSON

To clipboard

{
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CVE-2026-59724 (GCVE-0-2026-59724)

Vulnerability from nvd – Published: 2026-07-08 15:35 – Updated: 2026-07-08 19:41

Title

Socket.IO: Engine.IO WebTransport SID DoS

Summary

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 17:58 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/1fa1…	x_refsource_MISC
https://github.com/socketio/socket.io/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
socketio	socket.io	Affected: >= 6.5.0, < 6.6.7

Show details on NVD website

JSON

To clipboard

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CVE-2026-33151 (GCVE-0-2026-33151)

Vulnerability from nvd – Published: 2026-03-20 20:13 – Updated: 2026-03-23 16:50

Title

socket.io allows an unbounded number of binary attachments

Summary

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.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-23 16:50 UTC

CWE

CWE-20 - Improper Input Validation
CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/719f…	x_refsource_MISC
https://github.com/socketio/socket.io/commit/9d39…	x_refsource_MISC
https://github.com/socketio/socket.io/commit/b257…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
socketio	socket.io	Affected: < 3.3.5 Affected: >= 3.4.0, < 3.4.4 Affected: >= 4.0.0, < 4.2.6

Show details on NVD website

JSON

To clipboard

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CVE-2024-38355 (GCVE-0-2024-38355)

Vulnerability from nvd – Published: 2024-06-19 19:48 – Updated: 2024-09-03 20:35

Title

Unhandled 'error' event in socket.io

Summary

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. This issue is fixed by commit `15af22fc22` which has been included in `socket.io@4.6.2` (released in May 2023). The fix was backported in the 2.x branch as well with commit `d30630ba10`. Users are advised to upgrade. Users unable to upgrade may attach a listener for the "error" event to catch these errors.

Severity

7.3 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-03 15:54 UTC

CWE

CWE-20 - Improper Input Validation
CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/socketio/socket.io/security/ad…	x_refsource_CONFIRM
https://github.com/socketio/socket.io/commit/15af…	x_refsource_MISC
https://github.com/socketio/socket.io/commit/d306…	x_refsource_MISC
https://www.vicarius.io/vsociety/posts/unhandled-…

Impacted products

2 products

Vendor	Product	Version
socketio	socket.io	Affected: < 2.5.1 Affected: >= 3.0.0,< 4.6.2
socket	socket.io	Affected: 0 , < 2.5.1 (custom) Affected: 3.0.0 , < 4.6.2 (custom) cpe:2.3:a:socket:socket.io::::::node.js::*

Show details on NVD website

JSON

To clipboard

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        "discovery": "UNKNOWN"
      },
      "title": "Unhandled \u0027error\u0027 event in socket.io"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-38355",
    "datePublished": "2024-06-19T19:48:50.193Z",
    "dateReserved": "2024-06-14T14:16:16.464Z",
    "dateUpdated": "2024-09-03T20:35:40.515Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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7 vulnerabilities found for socket.io by socketio

CVE-2026-102599 (GCVE-0-2026-102599)

CVE-2026-102600 (GCVE-0-2026-102600)

CVE-2026-69185 (GCVE-0-2026-69185)

CVE-2026-59725 (GCVE-0-2026-59725)

CVE-2026-59724 (GCVE-0-2026-59724)

CVE-2026-33151 (GCVE-0-2026-33151)

CVE-2024-38355 (GCVE-0-2024-38355)