(maint) Update GitHubSig to current GitHub RSA host key#277
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GitHub rotated its RSA SSH host key on 2023-03-24 after the prior private key was briefly exposed. The hard-coded GitHubSig still held the retired key, so appending it to a host's known_hosts collides with the key GitHub now presents, producing "REMOTE HOST IDENTIFICATION HAS CHANGED" and aborting ssh-based git clones (e.g. of private repos in pre-suites). Replace it with the current RSA host key (fingerprint SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s, verified against GitHub's published value). Also drop the pinned IP 207.97.227.239 from the entry: GitHub serves SSH from many rotating addresses, so pinning one IP adds no security and risks further stale-entry mismatches. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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beechtom
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Jun 4, 2026
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Confirmed this avoids the ugly warning: |
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Summary
GitHubSigstill held GitHub's retired RSA SSH host key. GitHub rotated its RSA host key on 2023-03-24 (after the prior private key was briefly exposed), so appending the oldGitHubSigto a host'sknown_hostsnow collides with the key GitHub actually presents. SSH then refuses the connection with:which breaks ssh-based
git clones in pre-suites that rely onenable_git_https_access/GitHubSig(e.g. cloning private repos).Change
GitHubSigwith GitHub's current RSA host key. FingerprintSHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s, verified against GitHub's published SSH key fingerprints.207.97.227.239from the entry. GitHub serves SSH from many rotating addresses, so pinning a single IP provides no security benefit and risks further stale-entry mismatches.Verification
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