CVE-2026-48501: Github.com/cli/cli/v2 GitHub CLI Has An Incorrect Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8xvp-7hj6-mcj9",
  "modified" : "2026-06-09T10:30:16Z",
  "published" : "2026-05-29T15:30:13Z",
  "aliases" : [ "CVE-2026-48501" ],
  "summary" : "GitHub CLI has an incorrect authorization header in API requests to TUF repository mirrors via `gh attestation`, `gh release verify`, and `gh release verify-asset` commands",
  "details" : "### Summary\n\nGitHub 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.\n\n **Affected users:**\n\n  - 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.\n  - 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.\n\n### Details\n\nThe 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.\n\nSpecifically, 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.\n\nThe `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.\n\n### Impact\n\nTokens were transmitted in HTTP headers to the listed hosts during normal `gh attestation`, `gh release verify`, and `gh release verify-asset` operations. There is no evidence that tokens were logged, retained, or accessed by unauthorized parties. If a token were captured, it would grant the same access as the token holder, potentially including private repositories, organization resources, or enterprise administration depending on token type and permissions.\n\n### Remediation and mitigation\n\n1. Revoke authentication tokens used with the GitHub CLI: \n    - [Personal access tokens](https://docs.github.com/en/enterprise-cloud@latest/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens)\n    - [GitHub CLI OAuth app](https://docs.github.com/en/apps/using-github-apps/reviewing-and-revoking-authorization-of-github-apps#reviewing-your-authorized-github-apps)\n2. Upgrade `gh` to `2.93.0`.\n3. Review personal [security logs](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/reviewing-your-security-log) and any relevant [audit logs](https://docs.github.com/en/enterprise-cloud@latest/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/identifying-audit-log-events-performed-by-an-access-token) for actions associated with personal or enterprise accounts.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cli/cli/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.93.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.92.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cli/cli/security/advisories/GHSA-8xvp-7hj6-mcj9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48501"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cli/cli"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cli/cli/releases/tag/v2.93.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-29T15:30:13Z",
    "nvd_published_at" : "2026-05-29T16:16:31Z"
  }
}