#4662·crowdsec

[Bot detection] Add a second kind of fingerprint collection

Author: DryusdanCreated Sep 5, 2026Updated Sep 7, 2026
Labelskind/featureneeds/triage

What would you like to be added?

/kind feature

I was really looking forward to the bot detection feature. But, the fingerprint collection require Javascript (and maybe someday can be spoofed ?). Also, javascript requirement can be a blocker for some users who disable Javascript or some reader that don't implement it.

I think, adding a TLS fingerprint (like ja4 and not ja4+) with matching user_agent and fingerprint to determine if user can access or not (without javascript) and let admin choose if tls fingerprint is require, device fingerprint or both

Why is this needed?

This is needed to no discriminate some users, device or something else and (maybe) make Crowdsec’s WAF even more secure

PS : another haproxy ressource : https://github.com/O-X-L/haproxy-ja4-fingerprint ^^