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We updated our RSA SSH host key

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 We did this to protect our users from any chance of an adversary impersonating GitHub or eavesdropping on their Git operations over SSH. This key does not grant access to GitHub’s infrastructure or customer data. This change only impacts Git operations over SSH using RSA. Web traffic to and HTTPS Git operations are not affected.

Only’s RSA SSH key was replaced. No change is required for ECDSA or Ed25519 users. Our keys are documented here.

What happened and what actions have we taken?

This week, we discovered that’s RSA SSH private key was briefly exposed in a public GitHub repository. We immediately acted to contain the exposure and began investigating to understand the root cause and impact. We have now completed the key replacement, and users will see the change propagate over the next thirty minutes. Some users may have noticed that the new key was briefly present beginning around 02:30 UTC during preparations for this change.

Please note that this issue was not the result of a compromise of any GitHub systems or customer information. Instead, the exposure was the result of what we believe to be an inadvertent publishing of private information. We have no reason to believe that the exposed key was abused and took this action out of an abundance of caution.

What you can do

If you are using our ECDSA or Ed25519 keys, you will not notice any change and no action is needed.

If you see the following message when connecting to via SSH, then read onward.

Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
Please contact your system administrator.
Add correct host key in ~/.ssh/known_hosts to get rid of this message.
Host key for has changed and you have requested strict checking.
Host key verification failed.

If you see the above message, you’ll need to remove the old key by running this command:

$ ssh-keygen -R

Or manually updating your ~/.ssh/known_hosts file to remove the old entry.

Then, you can manually add the following line to add the new RSA SSH public key entry to your ~/.ssh/known_hosts file: ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCj7ndNxQowgcQnjshcLrqPEiiphnt+VTTvDP6mHBL9j1aNUkY4Ue1gvwnGLVlOhGeYrnZaMgRK6+PKCUXaDbC7qtbW8gIkhL7aGCsOr/C56SJMy/BCZfxd1nWzAOxSDPgVsmerOBYfNqltV9/hWCqBywINIR+5dIg6JTJ72pcEpEjcYgXkE2YEFXV1JHnsKgbLWNlhScqb2UmyRkQyytRLtL+38TGxkxCflmO+5Z8CSSNY7GidjMIZ7Q4zMjA2n1nGrlTDkzwDCsw+wqFPGQA179cnfGWOWRVruj16z6XyvxvjJwbz0wQZ75XK5tKSb7FNyeIEs4TT4jk+S4dhPeAUC5y+bDYirYgM4GC7uEnztnZyaVWQ7B381AK4Qdrwt51ZqExKbQpTUNn+EjqoTwvqNj4kqx5QUCI0ThS/YkOxJCXmPUWZbhjpCg56i+2aB6CmK2JGhn57K5mj0MNdBXA4/WnwH6XoPWJzK5Nyu2zB3nAZp+S5hpQs+p1vN1/wsjk=

Or automatically update’s RSA SSH key in your ~/.ssh/known_hosts, by running the following in your terminal:

$ ssh-keygen -R
$ curl -L | jq -r '.ssh_keys | .[]' | sed -e 's/^/ /' >> ~/.ssh/known_hosts

You can verify that your hosts are connecting via our new RSA SSH key by confirming that you see the following fingerprint:


GitHub Actions users may see failed workflow runs if they are using actions/checkout with the ssh-key option. We are updating the actions/checkout action in all our supported tags, including @v2, @v3, and @main. If you pin the action to a commit SHA and use the ssh-key option, you’ll need to update your workflow. You can read more about this process in our official documentation for Actions security hardening.

For more information, please visit our official documentation on GitHub’s SSH public key fingerprints.

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By |2023-03-24T07:18:23+00:00March 24th, 2023|Education|0 Comments

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