Resource exhaustion in engine.io
Engine.IO before 4.0.0 and 3.6.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | engine.io | < 3.6.0 | 3.6.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-36048
- https://github.com/socketio/engine.io/commit/58e274c437e9cbcf69fd913c813aad8fbd253703
- https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b
- https://blog.caller.xyz/socketio-engineio-dos
- https://github.com/bcaller/kill-engine-io
- https://github.com/socketio/engine.io
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- npm
- Package
engine.io- Disclosed
- 09.02.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-j4f2-536g-r55m - CC BY 4.0
Vulnerability history: engine.io
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 01.2022 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 2
Disclosures per year
- 2022: 3
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 3
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Resource exhaustion in engine.io this entry
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