[engine.io] 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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-36048
• 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/advisories/GHSA-j4f2-536g-r55m