An excerpt from: http://www.tomsguide.com/us/django-long-password-security,news-17557.html
"A double-edged sword
In the case of a brute-force attack, the attacker is trying to gain access to the system. But the developer found that if the attackers are just trying to mess things up, they could go to Django's login page and repeatedly submit hundreds of extremely long "junk" passwords of thousands of characters or more.
Having to check all these junk passwords against the stored cryptographic hashes puts a heavy strain on Django's system and eventually overtaxes it.
The result is essentially a denial-of-service attack, which is when attackers bombard a server with website hits or other requests that, when combined, eventually bring the server offline.
There haven't been any known attacks that used this method. Nevertheless, Django has since patched this vulnerability by setting a limit on password length: 4096 bytes, or around 4,096 of the characters found on a keyboard. The updated version is available on Django's website. So what's the takeaway? Users should keep using long passwords. Developers, however, should be aware that strong password security could become a double-edged sword."
Going through the admin options and realized that there is not an option for a maximum password length.
I have seen, previously, this feature having its purpose questioned (https://github.com/NodeBB/NodeBB/issues/261), indicating it used to be a thing.. however it does not appear to be now. Does anybody know why?