TI-2020-18427 Aliases CVE-2020-36048 GHSA-j4f2-536g-r55m

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource…

LOW 39CWE-400Published 2021-01-07 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.

Why it matters now

EPSS 0.03276 88th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial engine.io (npm): 3.6.0Red Hat: 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	engine.io (npm)	before 3.6.0	3.6.0	Patch available	GHSA-j4f2-536g-r55m

— Vendor— Affected all versions Fixed in — No fix listed CNA
engine.io (npm) Vendor— Affected before 3.6.0 Fixed in 3.6.0 Patch available GHSA-j4f2-536g-r55m

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:socket:engine.io::::::::	before 4.0.0	Vulnerable	socketio

cpe:2.3:a:socket:engine.io:*:*:*:*:*:*:*:* Versions before 4.0.0 Vulnerable ·socketio

Remediation

Fix · GHSA-j4f2-536g-r55m engine.io (npm) Fixed in 3.6.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Quay 3	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2020-36048
2026-10-03 Alias added: GHSA-j4f2-536g-r55m

References

Exploit 1

https://blog.caller.xyz/socketio-engineio-dos/

Patch 1

https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b

Advisory 2

Other 3

TI-2022-20281 Uncaught exception in engine.io CVSS 3.1HIGH 7.1
TI-2022-06052 Uncaught Exception in engine.io CVSS 3.1HIGH 7.5
TI-2026-42594 Socket.IO: Engine.IO Polling Transport Connection Exhaustion CVSS 3.1HIGH 7.5
TI-2026-42593 Socket.IO: Engine.IO WebTransport SID DoS CVSS 3.1HIGH 7.5
TI-2023-14835 Uncaught exception in engine.io CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences