There seems to be some breach at lemmy.world and, at the very least, an admin account was compromised.
Out of an abundance of caution, DubVee has temporarily added lemmy.world to our blocklist while they sort out their problem.
I'm monitoring the admin chat and awaiting word from the LW admins confirming they are back in control of their site. Once that has been confirmed, federation with lemmy.world will resume.
Update: Looks like they may be back in control over at LW, but they're still sorting things out. Regardless, the bad actor that was in control had defederated all hosts besides threads [dot] net so removing lemmy.world from our blocklist right now would be pointless.
Update #2: lemmy.world seems to be back in control and the vector used for this attack was mitigated. They've posted a response here: https://lemmy.world/post/1290412
As of 8am, we are resuming federation with lemmy.world