Resource exhaustion in socket.io-parser
The socket.io-parser npm package before versions 3.3.2 and 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach is used.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | socket.io-parser | < 3.3.2, >= 3.4.0, < 3.4.1 | 3.3.2, 3.4.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-36049
- https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55
- https://blog.caller.xyz/socketio-engineio-dos
- https://github.com/bcaller/kill-engine-io
- https://github.com/socketio/socket.io-parser/releases/tag/3.3.2
- https://github.com/socketio/socket.io-parser/releases/tag/3.4.1
- https://www.npmjs.com/package/socket.io-parser
- 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
socket.io-parser- Disclosed
- 30.06.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xfhh-g9f5-x4m4 - CC BY 4.0
Vulnerability history: socket.io-parser
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
- 5
- First → latest
- 06.2021 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 3
- Medium 1
Disclosures per year
- 2021: 1
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 2
-
Resource exhaustion in socket.io-parser this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.