GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.93.0, GitHub CLI incorrectly includes authorization header in API requests to TUF repository mirrors via gh attestation, gh release verify, and gh release verify-asset commands. The CLI uses a shared HTTP client with an authentication layer that automatically attaches tokens to outgoing requests. This layer lacks accurate host detection and can incorrectly attribute the target host, providing it with a token it should never receive. Specifically, the host normalization logic collapses any *.github.com subdomain to github.com, so a request to tuf-repo.github.com (a GitHub Pages site, not a GitHub API endpoint) is treated as a request to github.com and receives the user's github.com token. For hosts that don't match github.com or a known GHES instance at all, the resolver falls back to GH_ENTERPRISE_TOKEN if set. The gh attestation, gh release verify and gh release verify-asset commands fetch data from several external hosts as part of their normal operation (TUF metadata from tuf-repo.github.com and tuf-repo-cdn.sigstore.dev, artifact bundles from Azure Blob Storage). Because these requests go through the same authenticated HTTP client, the token is sent to all of them. This vulnerability is fixed in 2.93.0.

Affected: Go: github.com/cli/cli/v2

### Summary

GitHub CLI incorrectly includes an authorization header in API requests to TUF repository mirrors via `gh attestation`, `gh release verify`, and `gh release verify-asset` commands.

**Affected users:**

- Authenticated `github.com` users who previously ran `gh attestation` commands, `gh release verify`, or `gh release verify-asset`: the `github.com` token was included in requests to `tuf-repo.github.com`, a GitHub Pages domain that is not a GitHub API endpoint. All authentication types are affected. - Users with `GH_ENTERPRISE_TOKEN` or `GITHUB_ENTERPRISE_TOKEN` set who previously ran `gh attestation` commands, `gh release verify`, or `gh release verify-asset`: the enterprise token was included in requests to external hosts `tuf-repo-cdn.sigstore.dev` and `tmaproduction.blob.core.windows.net`. These hosts are not operated by GitHub.

### Details

The CLI uses a shared HTTP client with an authentication layer that automatically attaches tokens to outgoing requests. This layer lacks accurate host detection and can incorrectly attribute the target host, providing it with a token it should never receive.

Specifically, the host normalization logic collapses any `*.github.com` subdomain to `github.com`, so a request to `tuf-repo.github.com` (a GitHub Pages site, not a GitHub API endpoint) is treated as a request to `github.com` and receives the user's github.com token. For hosts that don't match `github.com` or a known GHES instance at all, the resolver falls ba…

Withdrawn by the publisher.

Affected: Ubuntu:24.04:LTS: golang-github-cli-go-gh, Ubuntu:Pro:24.04:LTS: golang-github-cli-go-gh-v2, Ubuntu:25.10: golang-github-cli-go-gh, Ubuntu:25.10: golang-github-cli-go-gh-v2, Ubuntu:26.04:LTS: golang-github-cli-go-gh, Ubuntu:26.04:LTS: golang-github-cli-go-gh-v2

GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.93.0, GitHub CLI incorrectly includes authorization header in API requests to TUF repository mirrors via gh attestation, gh release verify, and gh release verify-asset commands. The CLI uses a shared HTTP client with an authentication layer that automatically attaches tokens to outgoing requests. This layer lacks accurate host detection and can incorrectly attribute the target host, providing it with a token it should never receive. Specifically, the host normalization logic collapses any *.github.com subdomain to github.com, so a request to tuf-repo.github.com (a GitHub Pages site, not a GitHub API endpoint) is treated as a request to github.com and receives the user's github.com token. For hosts that don't match github.com or a known GHES instance at all, the resolver falls back to GH_ENTERPRISE_TOKEN if set. The gh attestation, gh release verify and gh release verify-asset commands fetch data from several external hosts as part of their normal operation (TUF metadata from tuf-repo.github.com and tuf-repo-cdn.sigstore.dev, artifact bundles from Azure Blob Storage). Because these requests go through the same authenticated HTTP client, the token is sent to all of them. This vulnerability is fixed in 2.93.0.