That’s what this meme is referencing. That was the XZ Utils backdoor. The contributor spent 5 years gaining the lead dev’s trust, waited for the lead dev to get busy with other things, then basically bullied the lead dev into handing over control of the project. They quietly pushed an SSH backdoor.

And then they were almost immediately called out by a dude who was running benchmarks and realized that his SSH requests were taking like 5ms longer than they should. That delay was because the backdoor was checking the SSH request against a table of backdoor requests, to see if it should allow the connection even if the UN/PW was wrong.

The big concern was that the SSH system was used all over the world. But rolling back to a previous version was easy, and most systems hadn’t updated yet anyways.

yeah this meme is referencing xz