Market & Regulation
GitHub deprecates SHA-1 SSH keys, adds post-quantum crypto
GitHub Changeloghigh confidence
Why it matters
- →Developers using older Git clients or SSH libraries may face connection failures after 2026.
- →GitHub is pioneering post-quantum cryptography adoption in mainstream developer tools.
- →The deprecation of SHA-1 signatures forces a security upgrade for legacy RSA key usage.
GitHub announced significant changes to its SSH security protocols, effective in 2026. The platform will remove support for the ssh-rsa signature type (SHA-1) and the diffie-hellman-group-exchange-sha256 key exchange mechanism. New RSA keys must be at least 3072 bits. Additionally, GitHub is adding support for the post-quantum key exchange method mlkem768x25519-sha256 on github.com and GitHub Enterprise Cloud (excluding US regions). These changes apply to SSH connections; HTTPS users are unaffected. Users must ensure their Git clients support rsa-sha2 signatures or switch to Ed25519 keys.
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GitHub Deprecates All-Platform CodeQL Bundle
GitHub is killing the convenience of a single download for CodeQL CLI. Starting with version 2.27.0, the monolithic all-platform bundle is deprecated and will vanish by March 2027. Users must now switch to platform-specific archives, a move that forces CI/CD pipelines to manage separate artifacts for Linux ARM64, x86_64, and macOS. This ends the era of 'one size fits all' distribution for static analysis tooling on GitHub, requiring developers to explicitly target their build environment's architecture.
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