MacDebug

Verified for macOS Tahoe 26.2

Fix Guide: Git Credential Helper Failing on Sequoia

Symptom: After updating to macOS Sequoia, Git operations that require authentication (push, pull, clone private repos) fail with "Authentication failed" or "fatal: could not read Username." Git credential helper prompts for password but then fails to save or retrieve credentials from macOS Keychain. Running git credential-osxkeychain get returns nothing. This affects GitHub, GitLab, Bitbucket, and other Git hosting services.

Why this happens

Git on macOS uses git-credential-osxkeychain to store credentials in the system Keychain via the Security.framework API. macOS Sequoia introduced stricter keychain access controls through the securityd daemon. Applications now need explicit keychain access entitlements, and the com.apple.security.keychain-access-groups entitlement must be properly signed.

If you installed Git via Homebrew or MacPorts (not Xcode Command Line Tools), the credential helper binary may not be properly signed for Sequoia's requirements. Additionally, Sequoia's updated applessdp (Apple Secure Service Discovery Protocol) changed how keychain items are associated with applications, causing older keychain entries to become orphaned.

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Fix 1: Reconfigure Git Credential Helper and Reset Keychain

Reset Git's credential helper and clear stale keychain entries:

# Check current credential helper
git config --global credential.helper

# Remove existing credential helper config
git config --global --unset credential.helper

# Remove cached credentials
rm -rf ~/.git-credentials

# Set credential helper to osxkeychain
git config --global credential.helper osxkeychain

# Clear Git-related keychain entries
security delete-generic-password -s "github.com" 2>/dev/null
security delete-generic-password -s "gitlab.com" 2>/dev/null
security delete-internet-password -s "github.com" 2>/dev/null

# Restart securityd
sudo killall -9 securityd

# Test with a Git operation (it will prompt for credentials again)
# Example:
# git clone https://github.com/your-username/private-repo.git

When prompted, enter your credentials. For GitHub, use a Personal Access Token instead of your password.

Fix 2: Reinstall Git with Proper Xcode Command Line Tools

Ensure Git is the Apple-signed version:

# Check which Git you're using
which git
type git

# If Git is from Homebrew (/usr/local/bin/git or /opt/homebrew/bin/git)
# temporarily prioritize Apple's Git:

# Backup your PATH
echo $PATH

# Prepend Apple's Git location
export PATH="/usr/bin:$PATH"

# Verify you're now using Apple's Git
which git
# Should show: /usr/bin/git

# Check if credential helper is available
git credential-osxkeychain

# If not found, install Xcode Command Line Tools:
xcode-select --install

# Or reset Command Line Tools:
sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install

# Make PATH change permanent (add to ~/.zshrc or ~/.bash_profile):
echo 'export PATH="/usr/bin:$PATH"' >> ~/.zshrc

# Reload shell configuration
source ~/.zshrc

Fix 3: Use SSH Keys Instead of HTTPS Authentication

Switch to SSH-based authentication to bypass credential helper issues:

# Generate new SSH key (if you don't have one)
ssh-keygen -t ed25519 -C "your-email@example.com"
# Press Enter to use default location (~/.ssh/id_ed25519)

# Start SSH agent
eval "$(ssh-agent -s)"

# Add SSH key to agent (macOS Keychain integration)
ssh-add --apple-use-keychain ~/.ssh/id_ed25519

# Copy public key to clipboard
pbcopy < ~/.ssh/id_ed25519.pub

# Add the key to your Git hosting service:
# GitHub: Settings → SSH and GPG keys → New SSH key
# GitLab: Preferences → SSH Keys
# Bitbucket: Personal settings → SSH keys

# Update existing repository remote to use SSH
git remote -v  # Check current remote URL

# Change from HTTPS to SSH (example for GitHub):
git remote set-url origin git@github.com:username/repository.git

# Verify
git remote -v

# Test SSH connection
ssh -T git@github.com

Configure SSH to use macOS Keychain permanently:

# Edit or create SSH config
nano ~/.ssh/config

# Add these lines:
Host *
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/id_ed25519

Recommended Tool: **GitHub Desktop**

GitHub Desktop is a free, official Git client from GitHub that handles authentication seamlessly on macOS Sequoia. It uses OAuth-based authentication instead of relying on keychain credential helpers, bypassing the issues with git-credential-osxkeychain entirely. GitHub Desktop manages credentials through secure browser-based authentication and stores tokens independently of the system Keychain. It works with GitHub, GitHub Enterprise, and also supports adding other Git repositories. For developers frustrated with command-line Git authentication on Sequoia, GitHub Desktop provides a reliable GUI alternative with built-in conflict resolution, branch visualization, and pull request management.