CVE-2020-36049

7.5 highEPSS 2.7%

socket.io-parser before 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach is used.

Severity

CVSS 3.1

7.5 high

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

EPSS: 2.7% chance of exploitation in the next 30 days; higher than 85% of CVEs (scores of 2026-10-31)
CWE: CWE-770
Published: 2021-01-08
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

socket:socket.io-parser

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-xfhh-g9f5-x4m4	npm	socket.io-parser	<3.3.2	3.3.2
GHSA-xfhh-g9f5-x4m4	npm	socket.io-parser	>=3.4.0 <3.4.1	3.4.1

References

https://blog.caller.xyz/socketio-engineio-dos/
https://github.com/bcaller/kill-engine-io
https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55
https://blog.caller.xyz/socketio-engineio-dos/
https://github.com/bcaller/kill-engine-io

Check your stack JSON