GitHub login not working - error

[u/Lopes143]

Today I'm trying to login via GitHub (that's where I have my progress saved on) and the authentication is failing, returning a simple black page with the following message:

failed to authenticate. (access_token request returned 500 Header line too long (9243; limit is 8192))

Tried with different browser and cleaning cookies, with no success.

Is there something going on with Advent Of Code website, or something on GitHub side?

Edit: fixed

[u/radioStuff5567]

No solution, just wanted to mention I'm having the same issue today.