It is also possible that a host key has just been changed. Someone could be eavesdropping on you right now (man-in-the-middle attack)! WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! If you see the following message when connecting to via SSH, then read onward.
If you are using our ECDSA or Ed25519 keys, you will not notice any change and no action is needed. We have no reason to believe that the exposed key was abused and took this action out of an abundance of caution. Instead, the exposure was the result of what we believe to be an inadvertent publishing of private information. Please note that this issue was not the result of a compromise of any GitHub systems or customer information. Some users may have noticed that the new key was briefly present beginning around 02:30 UTC during preparations for this change. We have now completed the key replacement, and users will see the change propagate over the next thirty minutes. We immediately acted to contain the exposure and began investigating to understand the root cause and impact. This week, we discovered that ’s RSA SSH private key was briefly exposed in a public GitHub repository. What happened and what actions have we taken? No change is required for ECDSA or Ed25519 users. Web traffic to and HTTPS Git operations are not affected. This change only impacts Git operations over SSH using RSA. This key does not grant access to GitHub’s infrastructure or customer data.
We did this to protect our users from any chance of an adversary impersonating GitHub or eavesdropping on their Git operations over SSH. At approximately 05:00 UTC on March 24, out of an abundance of caution, we replaced our RSA SSH host key used to secure Git operations for.
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