It's in the published source code, as a usable feature, just flagged as experimental and not compiled by default. It's not like this is some random development branch. It's there, to be used en route to being stable. People will have downloaded a release tagged version of the source code, compiled that feature in and used it.
By what definition is that not shipped?
> I am actually completely shocked this needs to be explained. Legitimate insanity.
I've had an optional experimental feature marked with a CVE. It's not a big deal as it just lets folks know that they should upgrade if they are using that experimental feature in the affected versions.
Where did you get this info? It might be the feature is actively being worked on and the DoS is a known issue which would be fixed before merge. Lot of projects have contrib folder for random scripts and other things which wouldn't get merged before some review but users are free to run the script if they want to. Experimental compile time build flags are experimental by definition.
By what definition is that not shipped?
> I am actually completely shocked this needs to be explained. Legitimate insanity.
Right back at you.